B1269

THEFT DETERRENT / KEYLESS ENTRY: THEFT DETERRENT SYSTEM: B1269: Theft Deterrent ECU Communication Stop

DTC B1269 - Theft Deterrent ECU Communication Stop

DESCRIPTION

DTC B1269 is output when the communication between the theft warning ECU assembly and the main body ECU stops for more than 10 seconds.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (BATTERY VOLTAGE)
(a) Disconnect the E72 theft warning ECU assembly connector.




(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:






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

2. CHECK HARNESS AND CONNECTOR (THEFT WARNING ECU ASSEMBLY - MAIN BODY ECU)
(a) Disconnect the E63 main body ECU connectors.




(b) 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. CONFIRM DTC
(a) Clear the DTC Theft Deterrent System.
(b) Check if the same DTC is detected.
HINT: Reinstall the sensors, connectors, etc. and restore the previous vehicle conditions before rechecking for DTCs.

Result:






C -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
B -- USE SIMULATION METHOD TO CHECK
A -- Continue to next step.

4. REPLACE THEFT WARNING ECU ASSEMBLY
(a) Replace the theft warning ECU assembly Removal
NEXT -- Continue to next step.

5. CONFIRM DTC
(a) Clear the DTC Theft Deterrent System.
(b) Check if the same DTC is detected.
HINT: Reinstall the sensors, connectors, etc. and restore the previous vehicle conditions before rechecking for DTCs.

Result:






B -- REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)
A -- END