DTC B1128 [ADVANCED KEYLESS ENTRY AND START SYSTEM]

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DTC B1128

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

Diagnostic procedure

STEP

INSPECTION

ACTION
1
INSPECT COMMUNICATION CIRCUIT FOR CONTINUITY
•  Disconnect keyless control module connector and keyless antenna (interior, middle) connector.
•  Inspect the continuity between the following connector terminals.
―  Keyless control module: 1K—keyless antenna: A
―  Keyless control module: 1L—keyless antenna: B
•  Is there continuity?
Yes
Replace keyless antenna (interior, middle).
(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, middle) 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: B1127
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.