DTC B1129 [ADVANCED KEYLESS ENTRY AND START SYSTEM]

id09021g803500

DTC B1129 | Keyless antenna (interior, front center)
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DETECTION CONDITION | Keyless antenna does not operate
POSSIBLE CAUSE | • Keyless antenna (interior, front center) malfunction • Open or short circuit in wiring harness between keyless control module and keyless antenna • Keyless control module malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | INSPECT COMMUNICATION CIRCUIT FOR CONTINUITY • Disconnect keyless control module connector and keyless antenna (interior, front center) connector. • Inspect the continuity between the following connector terminals. ― Keyless control module: 1M—keyless antenna: A ― Keyless control module: 1N—keyless antenna: B • Is there continuity? | Yes | Replace keyless antenna (interior, front center). (See KEYLESS ANTENNA REMOVAL/INSTALLATION [ADVANCED KEYLESS ENTRY AND START SYSTEM].) Go to next step.
No | Repair the wiring harness between the keyless antenna (interior, front center) and keyless control module. Go to next step.
2 | INSPECT KEYLESS CONTROL MODULE • Clear the DTC using the M-MDS. • Turn the ignition switch to the ON position. • Is the DTC displayed? ― M-MDS: B1129 | Yes | Replace the keyless control module and perform the resetting procedure for the advanced keyless system when replacing the keyless control module. (See KEYLESS CONTROL MODULE REMOVAL/INSTALLATION [ADVANCED KEYLESS ENTRY AND START SYSTEM].)
No | DTC troubleshooting completed.