DTC B112A [Advanced Keyless And Start System]

DTC B112A CHART

DTC B112A	Keyless antenna (interior, front)
DETECTION CONDITION	Keyless antenna dose not operated.
POSSIBLE CAUSE	Open or short circuit in wiring harness between keyless control module and keyless antenna (interior, front) Keyless antenna (interior, front) malfunction Keyless control module malfunction
Courtesy of MAZDA MOTORS CORP.

DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	INSPECT COMMUNICATION CIRCUIT FOR CONTINUITY  Disconnect keyless control module connector and keyless antenna (interior, front) connector. Inspect the wiring harness between keyless antenna (interior, front) terminal A and keyless control module terminal 10, and keyless antenna (interior, front) terminal B and keyless control module terminal 1P for the following: Short to ground Short to power supply Open circuit Is there continuity?	Yes	Replace keyless antenna (interior, front). (See KEYLESS ANTENNA REMOVAL/INSTALLATION .) Go to next step.
		No	Repair the wiring harness between the keyless antenna (interior, front) and keyless control module. Go to next step.
2	INSPECT KEYLESS CONTROL MODULE  Turn the ignition switch to the ON position. Is the DTC displayed? M-MDS: B112A	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 .) (See CARD KEY ID CODE REGISTRATION [WITH ADVANCED KEYLESS SYSTEM] ) (See STEERING LOCK UNIT ID CODE REGISTRATION [WITH ADVANCED KEYLESS SYSTEM] ) (See KEYLESS CONTROL MODULE CONFIGURATION ) (See IMMOBILIZER SYSTEM-RELATED PARTS PROGRAMMING [WITH ADVANCED KEYLESS SYSTEM] )
		No	DTC troubleshooting completed.