| DTC Code | DTC Name |
|---|---|
| B1660/43 | Passenger Airbag ON/OFF Indicator Circuit Malfunction |
DESCRIPTION
The passenger airbag ON/OFF indicator circuit consists of the airbag ECU assembly and telltale light assembly (passenger airbag ON/OFF indicator).
The passenger airbag ON/OFF indicator indicates the operation condition of the front passenger airbag.
DTC B1660/43 is stored when a malfunction is detected in the passenger airbag ON/OFF indicator circuit.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1660/43 |
|
|
WIRING DIAGRAM
INSPECTION PROCEDURE
Note
After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work Click here.
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
PROCEDURE
CHECK PASSENGER AIRBAG ON/OFF INDICATOR CONDITION
Turn the power switch on (IG).
Check the passenger airbag ON/OFF indicator operation.
| Result | ||||||
|---|---|---|---|---|---|---|
|
Tech Tips
Refer to the normal condition of the passenger airbag ON/OFF indicator Click here.
| B |
|
CHECK CONNECTORS Click here |
| A |
|
CHECK CONNECTORS
Turn the power switch off.
Disconnect the cable from the negative (-) auxiliary battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.
Check that the connectors are properly connected to the airbag ECU assembly and telltale light assembly. Also check that the connectors that link the instrument panel wire, No. 2 instrument panel wire and No. 5 instrument panel wire are properly connected.
| OK |
|---|
| The connectors are properly connected. |
Tech Tips
If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection.
Disconnect the connectors from the airbag ECU assembly and telltale light assembly. Also disconnect the connectors that link the instrument panel wire, No. 2 instrument panel wire and No. 5 instrument panel wire.
Check that the terminals of connectors are not damaged.
| OK |
|---|
| The terminals are not deformed or damaged. |
| NG |
|
REPLACE WIRE HARNESS |
| OK |
|
CHECK PASSENGER AIRBAG ON/OFF INDICATOR
Connect the connectors that link the instrument panel wire, No. 2 instrument panel wire and No. 5 instrument panel wire.
Connect the connector to the telltale light assembly.
Connect the cable to the negative (-) auxiliary battery terminal.
Turn the power switch on (IG).
Check the passenger airbag ON/OFF indicator operation.
| OK |
|---|
| The passenger airbag ON/OFF indicator does not come on. |
| NG |
|
CHECK PASSENGER AIRBAG ON/OFF INDICATOR CIRCUIT (OPEN) Click here |
| OK |
|
CHECK DTC
| *1 | Telltale Light Assembly |
| *2 | Airbag ECU Assembly |
Turn the power switch off.
Disconnect the cable from the negative (-) auxiliary battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.
Connect the connector to the airbag ECU assembly.
Connect the cable to the negative (-) auxiliary battery terminal.
Clear the DTCs stored in memory Click here.
Turn the power switch off.
Turn the power switch on (IG), and wait for at least 60 seconds.
Check for DTCs Click here.
| OK |
|---|
| DTC B1660/43 is not output. |
Tech Tips
Codes other than DTC B1660/43 may be output at this time, but they are not related to this check.
| NG |
|
REPLACE AIRBAG ECU ASSEMBLY Click here |
| OK |
|
USE SIMULATION METHOD TO CHECK Click here
CHECK PASSENGER AIRBAG ON/OFF INDICATOR CIRCUIT (OPEN)
| *A | for RHD |
| *B | for LHD |
| *1 | Telltale Light Assembly |
| *2 | Airbag ECU Assembly |
| *3 | Service Wire |
| *a | Front view of wire harness connector (to Airbag ECU Assembly) |
| *b | Front view of wire harness connector (to Telltale Light Assembly) |
Turn the power switch off.
Disconnect the cable from the negative (-) auxiliary battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.
Disconnect the connector from the telltale light assembly.
Using a service wire, connect terminals 23 (PAON) and 17 (P-A/B) of connector B.
Note
Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.
Measure the resistance according to the value(s) in the table below.
| Standard Resistance | ||||||
|---|---|---|---|---|---|---|
|
||||||
|
| NG |
|
CHECK INSTRUMENT PANEL WIRE (OPEN) Click here |
| OK |
|
CHECK PASSENGER AIRBAG ON/OFF INDICATOR CIRCUIT (SHORT)
| *A | for RHD |
| *B | for LHD |
| *1 | Telltale Light Assembly |
| *2 | Airbag ECU Assembly |
| *a | Front view of wire harness connector (to Telltale Light Assembly) |
Disconnect the service wire from connector B.
Measure the resistance according to the value(s) in the table below.
| Standard Resistance | ||||||
|---|---|---|---|---|---|---|
|
||||||
|
| NG |
|
CHECK INSTRUMENT PANEL WIRE (SHORT) Click here |
| OK |
|
CHECK PASSENGER AIRBAG ON/OFF INDICATOR CIRCUIT (SHORT TO B+)
| *A | for RHD |
| *B | for LHD |
| *1 | Telltale Light Assembly |
| *2 | Airbag ECU Assembly |
| *a | Front view of wire harness connector (to Telltale Light Assembly) |
Connect the cable to the negative (-) auxiliary battery terminal.
Turn the power switch on (IG).
Measure the voltage according to the value(s) in the table below.
| Standard Voltage | |||||||||
|---|---|---|---|---|---|---|---|---|---|
|
|||||||||
|
Turn the power switch off.
Disconnect the cable from the negative (-) auxiliary battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.
| NG |
|
CHECK INSTRUMENT PANEL WIRE (SHORT TO B+) Click here |
| OK |
|
CHECK PASSENGER AIRBAG ON/OFF INDICATOR CIRCUIT (SHORT TO GROUND)
| *A | for RHD |
| *B | for LHD |
| *1 | Telltale Light Assembly |
| *2 | Airbag ECU Assembly |
| *a | Front view of wire harness connector (to Telltale Light Assembly) |
Measure the resistance according to the value(s) in the table below.
| Standard Resistance | |||||||||
|---|---|---|---|---|---|---|---|---|---|
|
|||||||||
|
| NG |
|
CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND) Click here |
| OK |
|
REPLACE AIRBAG ECU ASSEMBLY Click here
CHECK CONNECTORS
Turn the power switch off.
Disconnect the cable from the negative (-) auxiliary battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.
Check that the connectors are properly connected to the airbag ECU assembly and telltale light assembly. Also check that the connectors that link the instrument panel wire, No. 2 instrument panel wire and No. 5 instrument panel wire are properly connected.
| OK |
|---|
| The connectors are properly connected. |
Tech Tips
If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection.
Disconnect the connectors from the airbag ECU assembly and telltale light assembly. Also disconnect the connectors that link the instrument panel wire, No. 2 instrument panel wire and No. 5 instrument panel wire.
Check that the terminals of connectors are not damaged.
| OK |
|---|
| The terminals are not deformed or damaged. |
| NG |
|
REPLACE WIRE HARNESS |
| OK |
|
CHECK PASSENGER AIRBAG ON/OFF INDICATOR CIRCUIT (OPEN)
| *A | for RHD |
| *B | for LHD |
| *1 | Telltale Light Assembly |
| *2 | Airbag ECU Assembly |
| *3 | Service Wire |
| *a | Front view of wire harness connector (to Airbag ECU Assembly) |
| *b | Front view of wire harness connector (to Telltale Light Assembly) |
Connect the connectors that link the instrument panel wire, No. 2 instrument panel wire and No. 5 instrument panel wire.
Using a service wire, connect terminals 23 (PAON) and 17 (P-A/B) of connector B.
Note
Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.
Measure the resistance according to the value(s) in the table below.
| Standard Resistance | ||||||
|---|---|---|---|---|---|---|
|
||||||
|
| NG |
|
CHECK INSTRUMENT PANEL WIRE (OPEN) Click here |
| OK |
|
CHECK PASSENGER AIRBAG ON/OFF INDICATOR CIRCUIT (SHORT)
| *A | for RHD |
| *B | for LHD |
| *1 | Telltale Light Assembly |
| *2 | Airbag ECU Assembly |
| *a | Front view of wire harness connector (to Telltale Light Assembly) |
Disconnect the service wire from connector B.
Measure the resistance according to the value(s) in the table below.
| Standard Resistance | ||||||
|---|---|---|---|---|---|---|
|
||||||
|
| NG |
|
CHECK INSTRUMENT PANEL WIRE (SHORT) Click here |
| OK |
|
CHECK PASSENGER AIRBAG ON/OFF INDICATOR CIRCUIT (SHORT TO B+)
| *A | for RHD |
| *B | for LHD |
| *1 | Telltale Light Assembly |
| *2 | Airbag ECU Assembly |
| *a | Front view of wire harness connector (to Telltale Light Assembly) |
Connect the cable to the negative (-) auxiliary battery terminal.
Turn the power switch on (IG).
Measure the voltage according to the value(s) in the table below.
| Standard Voltage | |||||||||
|---|---|---|---|---|---|---|---|---|---|
|
|||||||||
|
Turn the power switch off.
Disconnect the cable from the negative (-) auxiliary battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.
| NG |
|
CHECK INSTRUMENT PANEL WIRE (SHORT TO B+) Click here |
| OK |
|
CHECK PASSENGER AIRBAG ON/OFF INDICATOR CIRCUIT (SHORT TO GROUND)
| *A | for RHD |
| *B | for LHD |
| *1 | Telltale Light Assembly |
| *2 | Airbag ECU Assembly |
| *a | Front view of wire harness connector (to Telltale Light Assembly) |
Measure the resistance according to the value(s) in the table below.
| Standard Resistance | |||||||||
|---|---|---|---|---|---|---|---|---|---|
|
|||||||||
|
| NG |
|
CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND) Click here |
| OK |
|
CHECK TELLTALE LIGHT ASSEMBLY (SOURCE VOLTAGE)
| *A | for RHD |
| *B | for LHD |
| *1 | Telltale Light Assembly |
| *2 | Airbag ECU Assembly |
| *a | Front view of wire harness connector (to Telltale Light Assembly) |
Connect the cable to the negative (-) auxiliary battery terminal.
Turn the power switch on (IG).
Measure the voltage according to the value(s) in the table below.
| Standard Voltage | ||||||
|---|---|---|---|---|---|---|
|
||||||
|
Turn the power switch off.
Disconnect the cable from the negative (-) auxiliary battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.
| NG |
|
REPLACE WIRE HARNESS OR BATTERY |
| OK |
|
CHECK PASSENGER AIRBAG ON/OFF INDICATOR
| *1 | Telltale Light Assembly |
| *2 | Airbag ECU Assembly |
| *a | Front view of wire harness connector (to Airbag ECU Assembly) |
Connect the connector to the telltale light assembly.
Connect the cable to the negative (-) auxiliary battery terminal.
Turn the power switch on (IG).
Check the indicator according to the conditions in the table below.
| Result | |||||||||
|---|---|---|---|---|---|---|---|---|---|
|
Turn the power switch off.
Disconnect the cable from the negative (-) auxiliary battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.
| NG |
|
REPLACE TELLTALE LIGHT ASSEMBLY Click here |
| OK |
|
CHECK DTC
| *1 | Telltale Light Assembly |
| *2 | Airbag ECU Assembly |
Connect the connector to the airbag ECU assembly.
Connect the cable to the negative (-) auxiliary battery terminal.
Clear the DTCs stored in memory Click here.
Turn the power switch off.
Turn the power switch on (IG), and wait for at least 60 seconds.
Check for DTCs Click here.
| OK |
|---|
| DTC B1660/43 is not output. |
Tech Tips
Codes other than DTC B1660/43 may be output at this time, but they are not related to this check.
| NG |
|
REPLACE AIRBAG ECU ASSEMBLY Click here |
| OK |
|
USE SIMULATION METHOD TO CHECK Click here
CHECK INSTRUMENT PANEL WIRE (OPEN)
| *1 | Telltale Light Assembly |
| *2 | Airbag ECU Assembly |
| *3 | No. 2 Instrument Panel Wire |
| *4 | Instrument Panel Wire |
| *5 | Service Wire |
| *a | Front view of wire harness connector (to Airbag ECU Assembly) |
| *b | Front view of wire harness connector (to No. 2 Instrument Panel Wire) |
Disconnect the instrument panel wire from the No. 2 instrument panel wire.
Tech Tips
The service wire has already been inserted into connector B.
Measure the resistance according to the value(s) in the table below.
| Standard Resistance | ||||||
|---|---|---|---|---|---|---|
|
Disconnect the service wire from connector B.
| NG |
|
REPLACE INSTRUMENT PANEL WIRE |
| OK |
|
CHECK NO. 2 INSTRUMENT PANEL WIRE (OPEN)
| *1 | Telltale Light Assembly |
| *2 | Airbag ECU Assembly |
| *3 | No. 5 Instrument Panel Wire |
| *4 | No. 2 Instrument Panel Wire |
| *5 | Instrument Panel Wire |
| *6 | Service Wire |
| *a | Front view of wire harness connector (to Instrument Panel Wire) |
| *b | Front view of wire harness connector (to No. 5 Instrument Panel Wire) |
Disconnect the No. 2 instrument panel wire from the No. 5 instrument panel wire.
Using a service wire, connect terminals 2 (PAON) and 14 (P-AB) of connector D.
Note
Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.
Measure the resistance according to the value(s) in the table below.
| Standard Resistance | ||||||
|---|---|---|---|---|---|---|
|
Disconnect the service wire from connector D.
| NG |
|
REPLACE NO. 2 INSTRUMENT PANEL WIRE |
| OK |
|
REPLACE NO. 5 INSTRUMENT PANEL WIRE
CHECK INSTRUMENT PANEL WIRE (SHORT)
| *1 | Telltale Light Assembly |
| *2 | Airbag ECU Assembly |
| *3 | No. 2 Instrument Panel Wire |
| *4 | Instrument Panel Wire |
| *a | Front view of wire harness connector (to No. 2 Instrument Panel Wire) |
Disconnect the instrument panel wire from the No. 2 instrument panel wire.
Measure the resistance according to the value(s) in the table below.
| Standard Resistance | ||||||
|---|---|---|---|---|---|---|
|
| NG |
|
REPLACE INSTRUMENT PANEL WIRE |
| OK |
|
CHECK NO. 2 INSTRUMENT PANEL WIRE (SHORT)
| *1 | Telltale Light Assembly |
| *2 | Airbag ECU Assembly |
| *3 | No. 5 Instrument Panel Wire |
| *4 | No. 2 Instrument Panel Wire |
| *5 | Instrument Panel Wire |
| *a | Front view of wire harness connector (to No. 5 Instrument Panel Wire) |
Disconnect the No. 2 instrument panel wire from the No. 5 instrument panel wire.
Measure the resistance according to the value(s) in the table below.
| Standard Resistance | ||||||
|---|---|---|---|---|---|---|
|
| NG |
|
REPLACE NO. 2 INSTRUMENT PANEL WIRE |
| OK |
|
REPLACE NO. 5 INSTRUMENT PANEL WIRE
CHECK INSTRUMENT PANEL WIRE (SHORT TO B+)
| *1 | Telltale Light Assembly |
| *2 | Airbag ECU Assembly |
| *3 | No. 2 Instrument Panel Wire |
| *4 | Instrument Panel Wire |
| *a | Front view of wire harness connector (to No. 2 Instrument Panel Wire) |
Disconnect the instrument panel wire from the No. 2 instrument panel wire.
Connect the cable to the negative (-) auxiliary battery terminal.
Turn the power switch on (IG).
Measure the voltage according to the value(s) in the table below.
| Standard Voltage | |||||||||
|---|---|---|---|---|---|---|---|---|---|
|
Turn the power switch off.
Disconnect the cable from the negative (-) auxiliary battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.
| NG |
|
REPLACE INSTRUMENT PANEL WIRE |
| OK |
|
CHECK NO. 2 INSTRUMENT PANEL WIRE (SHORT TO B+)
| *1 | Telltale Light Assembly |
| *2 | Airbag ECU Assembly |
| *3 | No. 5 Instrument Panel Wire |
| *4 | No. 2 Instrument Panel Wire |
| *5 | Instrument Panel Wire |
| *a | Front view of wire harness connector (to No. 5 Instrument Panel Wire) |
Disconnect the No. 2 instrument panel wire from the No. 5 instrument panel wire.
Connect the cable to the negative (-) auxiliary battery terminal.
Turn the power switch on (IG).
Measure the voltage according to the value(s) in the table below.
| Standard Voltage | |||||||||
|---|---|---|---|---|---|---|---|---|---|
|
| NG |
|
REPLACE NO. 2 INSTRUMENT PANEL WIRE |
| OK |
|
REPLACE NO. 5 INSTRUMENT PANEL WIRE
CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND)
| *1 | Telltale Light Assembly |
| *2 | Airbag ECU Assembly |
| *3 | No. 2 Instrument Panel Wire |
| *4 | Instrument Panel Wire |
| *a | Front view of wire harness connector (to No. 2 Instrument Panel Wire) |
Disconnect the instrument panel wire from the No. 2 instrument panel wire.
Measure the resistance according to the value(s) in the table below.
| Standard Resistance | |||||||||
|---|---|---|---|---|---|---|---|---|---|
|
| NG |
|
REPLACE INSTRUMENT PANEL WIRE |
| OK |
|
CHECK NO. 2 INSTRUMENT PANEL WIRE (SHORT TO GROUND)
| *1 | Telltale Light Assembly |
| *2 | Airbag ECU Assembly |
| *3 | No. 5 Instrument Panel Wire |
| *4 | No. 2 Instrument Panel Wire |
| *5 | Instrument Panel Wire |
| *a | Front view of wire harness connector (to No. 5 Instrument Panel Wire) |
Disconnect the No. 2 instrument panel wire from the No. 5 instrument panel wire.
Measure the resistance according to the value(s) in the table below.
| Standard Resistance | |||||||||
|---|---|---|---|---|---|---|---|---|---|
|
| NG |
|
REPLACE NO. 2 INSTRUMENT PANEL WIRE |
| OK |
|
REPLACE NO. 5 INSTRUMENT PANEL WIRE