AIRBAG SYSTEM, Diagnostic DTC:B1800/51, B1801/51, B1802/51, B1803/51

DTC Code	DTC Name
B1800/51	Short in Driver Side Squib Circuit
B1801/51	Open in Driver Side Squib Circuit
B1802/51	Short to GND in Driver Side Squib Circuit
B1803/51	Short to B+ in Driver Side Squib Circuit

DESCRIPTION

The driver side squib circuit consists of the center airbag sensor assembly, the spiral cable, and the steering pad.
The circuit instructs the SRS to deploy when deployment conditions are met.
These DTCs are recorded when a malfunction is detected in the driver side squib circuit.

DTC Code	Detection Condition	Trouble Area
B1800/51	One of the following conditions is met: The center airbag sensor assembly receives a line short circuit signal 5 times in the driver side squib circuit during the primary check. Driver side squib malfunction Spiral cable malfunction Center airbag sensor assembly malfunction	Instrument panel wire Spiral cable Steering pad (Driver side squib) Center airbag sensor assembly
B1801/51	One of the following conditions is met: The center airbag sensor assembly receives an open circuit signal in the driver side squib circuit for 2 seconds. Driver side squib malfunction Spiral cable malfunction Center airbag sensor assembly malfunction	Instrument panel wire Spiral cable Steering pad (Driver side squib) Center airbag sensor assembly
B1802/51	One of the following conditions is met: The center airbag sensor assembly receives a short circuit to ground signal in the driver side squib circuit for 0.5 seconds. Driver side squib malfunction Spiral cable malfunction Center airbag sensor assembly malfunction	Instrument panel wire Spiral cable Steering pad (Driver side squib) Center airbag sensor assembly
B1803/51	One of the following conditions is met: The center airbag sensor assembly receives a short circuit to B+ signal in the driver side squib circuit for 0.5 seconds. Driver side squib malfunction Spiral cable malfunction Center airbag sensor assembly malfunction	Instrument panel wire Spiral cable Steering pad (Driver side squib) Center airbag sensor assembly

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.
When disconnecting the cable from the negative (-) auxiliary battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected Click here.

Tech Tips

Perform the simulation method by selecting "check mode" (signal check) with the intelligent tester Click here.
After selecting "check mode" (signal check), perform the simulation method by wiggling each connector of the airbag system or driving the vehicle on various types of roads Click here.

PROCEDURE

CHECK STEERING PAD (DRIVER SIDE SQUIB)
1. Turn the power switch OFF.
2. Disconnect the negative (-) terminal cable from the auxiliary battery, and wait for at least 90 seconds.
3. Disconnect the connectors from the steering pad.
4. Connect the white wire side of SST (resistance: 2.1 Ω) to connector E (orange connector).
  
  CAUTION:
  
  Never connect the tester to the steering pad (driver side squib) for measurement, as this may lead to a serious injury due to airbag deployment.
  Note
  - Do not forcibly insert SST into the terminals of the connector when connecting SST.
  - Insert SST straight into the terminals of the connector.
  SST
  
  09843-18061
5. Connect the negative (-) terminal cable to the auxiliary battery, and wait for at least 2 seconds.
6. Turn the power switch ON (IG), and wait for at least 60 seconds.
7. Clear the DTCs Click here.
8. Turn the power switch OFF.
9. Turn the power switch ON (IG), and wait for at least 60 seconds.
10. Check for DTCs Click here.
  
  OK
  
  DTC B1800, B1801, B1802 or B1803 is not output.
  
  Tech Tips
  
  Codes other than DTC B1800, B1801, B1802 and B1803 may be output at this time, but they are not related to this check.
NG
CHECK CONNECTOR Click here

OK

REPLACE STEERING PAD Click here
CHECK CONNECTOR
1. Turn the power switch OFF.
2. Disconnect the negative (-) terminal cable from the auxiliary battery, and wait for at least 90 seconds.
3. Disconnect SST from connector E.
4. Check that the spiral cable connectors (on the steering pad side) are not damaged.
  
  OK
  
  The lock button is not disengaged, or the claw of the lock is not deformed or damaged.
NG
REPLACE SPIRAL CABLE Click here

OK

OK
DTC B1800, B1801, B1802 or B1803 is not output.

OK
The lock button is not disengaged, or the claw of the lock is not deformed or damaged.

CHECK DRIVER SIDE SQUIB CIRCUIT

Disconnect the connectors from the center airbag sensor assembly.
Connect the negative (-) terminal cable to the auxiliary battery, and wait for at least 2 seconds.
Turn the power switch ON (IG).

Measure the voltage according to the value(s) in the table below.

Standard voltage

Tester Connection	Switch Condition	Specified Condition
z11-1 (D-) - Body ground	Power switch ON (IG)	Below 1 V
z11-2 (D+) - Body ground	Power switch ON (IG)	Below 1 V

Turn the power switch OFF.
Disconnect the negative (-) terminal cable from the auxiliary battery, and wait for at least 90 seconds.

Measure the resistance according to the value(s) in the table below.

Standard resistance

Tester Connection	Condition	Specified Condition
z11-1 (D-) - z11-2 (D+)	Always	Below 1 Ω

Release the activation prevention mechanism built into connector B Click here.

Measure the resistance according to the value(s) in the table below.

Standard resistance

Tester Connection	Condition	Specified Condition
z11-1 (D-) - z11-2 (D+)	Always	1 MΩ or higher
z11-1 (D-) - Body ground	Always	1 MΩ or higher
z11-2 (D+) - Body ground	Always	1 MΩ or higher

CHECK INSTRUMENT PANEL WIRE (CENTER AIRBAG SENSOR ASSEMBLY - SPIRAL CABLE) Click here

CHECK CENTER AIRBAG SENSOR ASSEMBLY
1. Connect the connectors to the steering pad and the center airbag sensor assembly.
2. Connect the negative (-) terminal cable to the auxiliary battery, and wait for at least 2 seconds.
3. Turn the power switch ON (IG), and wait for at least 60 seconds.
4. Clear the DTCs Click here.
5. Turn the power switch OFF.
6. Turn the power switch ON (IG), and wait for at least 60 seconds.
7. Check for DTCs Click here.
  
  OK
  
  DTC B1800, B1801, B1802 or B1803 is not output.
  
  Tech Tips
  
  Codes other than DTC B1800, B1801, B1802 and B1803 may be output at this time, but they are not related to this check.
NG
REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

OK

USE SIMULATION METHOD TO CHECK Click here

OK
DTC B1800, B1801, B1802 or B1803 is not output.

CHECK INSTRUMENT PANEL WIRE (CENTER AIRBAG SENSOR ASSEMBLY - SPIRAL CABLE)

Restore the released activation prevention mechanism of connector B to its original condition.
Disconnect the instrument panel wire connector from the spiral cable.
Connect the negative (-) terminal cable to the auxiliary battery, and wait for at least 2 seconds.
Turn the power switch ON (IG).

Measure the voltage according to the value(s) in the table below.

Standard voltage

Tester Connection	Switch Condition	Specified Condition
L22-1 (D+) - Body ground	Power switch ON (IG)	Below 1 V
L22-2 (D-) - Body ground	Power switch ON (IG)	Below 1 V

Turn the power switch OFF.
Disconnect the negative (-) terminal cable from the auxiliary battery, and wait for at least 90 seconds.

Measure the resistance according to the value(s) in the table below.

Standard resistance

Tester Connection	Condition	Specified Condition
L22-1 (D+) - L22-2 (D-)	Always	Below 1 Ω

Release the activation prevention mechanism built into connector B Click here.

Measure the resistance according to the value(s) in the table below.

Standard resistance

Tester Connection	Condition	Specified Condition
L22-1 (D+) - L22-2 (D-)	Always	1 MΩ or higher
L22-1 (D+) - Body ground	Always	1 MΩ or higher
L22-2 (D-) - Body ground	Always	1 MΩ or higher

REPLACE INSTRUMENT PANEL WIRE

REPLACE SPIRAL CABLE Click here