B1243

DOOR LOCK: POWER DOOR LOCK CONTROL SYSTEM: B1243: GSW Terminal Circuit Malfunction

DTC B1243 - GSW Terminal Circuit Malfunction

DESCRIPTION

If the collision door lock release function does not operate normally, or an open or short in the GSW input circuit of the main body ECU is detected, DTC B1243 will be output.
HINT: If DTC B1243 is output, the speed-sensitive automatic door lock function, shift-linked automatic door unlock function, and collision door lock release function will be prohibited.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK DTC OUTPUT
(a) Delete the DTC Reading and Clearing Diagnostic Trouble Codes.
(b) Recheck for DTC.

Result





B -- USE SIMULATION METHOD TO CHECK
A -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (CENTER AIRBAG SENSOR - MAIN BODY ECU)
(a) Disconnect the negative (-) terminal cable from the battery.
CAUTION:
Wait at least 90 seconds after disconnecting the negative (-) terminal cable from the battery to prevent airbag and seat belt pretensioner activation.
NOTE:
When disconnecting the cable, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.




(b) Disconnect the L73 sensor connector.
(c) Disconnect the DA ECU connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. CHECK MAIN BODY ECU (GSW VOLTAGE)
(a) Disconnect the negative (-) terminal cable from the battery.
CAUTION:
Wait at least 90 seconds after disconnecting the negative (-) terminal cable from the battery to prevent airbag and seat belt pretensioner activation.
NOTE:
When disconnecting the cable, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.




(b) Reconnect the L73 sensor connector.
(c) Connect the negative (-) terminal cable to the battery.
(d) Turn the engine switch on (IG).
(e) Measure the voltage according to the value(s) in the table below.
Standard voltage:






NG -- REPLACE MAIN BODY ECU
OK -- Continue to next step.

4. REPLACE CENTER AIRBAG SENSOR
(a) Disconnect the negative (-) terminal cable from the battery.
CAUTION:
Wait at least 90 seconds after disconnecting the negative (-) terminal cable from the battery to prevent airbag and seat belt pretensioner activation.
NOTE:
When disconnecting the cable, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.
(b) Replace the center airbag sensor Removal.
NEXT -- Continue to next step.

5. CHECK DTC OUTPUT
(a) Delete the DTC Reading and Clearing Diagnostic Trouble Codes.
(b) Recheck for DTC.

Result





B -- END
A -- REPLACE MAIN BODY ECU