DTC Code | DTC Name |
---|---|
B1242 | Wireless Door Lock Tuner Circuit Malfunction |
DESCRIPTION
The electrical key antenna is used to receive electric waves relating to the entry functions of the smart entry and start system. The certification ECU (smart key ECU assembly) decodes the requested smart entry and start system operation by identifying a key code based on electric waves received via the electrical key antenna and the door control receiver.
The door control receiver receives a signal from the wireless door control transmitter and sends signals to the main body ECU through the certification ECU (smart key ECU assembly).
The certification ECU (smart key ECU assembly) then sends a command, according to the requested operation, to each ECU. (e.g. If door lock operation is requested, the ECU sends a door lock command to the main body ECU.)
DTC No. | DTC Detection Condition | Trouble Area |
---|---|---|
B1242 | The certification ECU (smart key ECU assembly) detects that there is a short in the circuit between terminals RSSI, or between terminals DATA and RDA. |
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WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - DOOR CONTROL RECEIVER)
Disconnect the D36 certification ECU (smart key ECU assembly) connector and O22 door control receiver connectors.
Measure the resistance according to the value(s) in the table below.
Standard resistance | ||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
INSPECT CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
Reconnect the D36 ECU connector.
Measure the voltage according to the value(s) in the table below.
Standard voltage | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
NG |
REPLACE DOOR CONTROL RECEIVER Click here |
OK |
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)