Diagnostic Procedure

WARNING: This page is about a different car, the 2017 Mazda CX-5. However, it is still accessible from the selected car via links, so may be relevant.

DTC B13CF:19 (FRONT BODY CONTROL MODULE) DIAGNOSTIC PROCEDURE

Step	Inspection		Action
1	VERIFY FRONT BODY CONTROL MODULE (FBCM) DTCs AGAIN Clear the DTC for the front body control module (FBCM) using the M-MDS. (See CLEARING DTC [FRONT BODY CONTROL MODULE (FBCM)] .) Retrieve the front body control module (FBCM) DTCs using the M-MDS. (See DTC INSPECTION [FRONT BODY CONTROL MODULE (FBCM)] .) Is the same DTC displayed?	Yes	Go to the next step.
1		No	Go to Step 6.
2	INSPECT FRONT BODY CONTROL MODULE (FBCM) CONNECTOR CONDITION Switch the ignition off. Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .) Disconnect the front body control module (FBCM) connector. Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. Is the connector normal?	Yes	Go to the next step.
2		No	Repair or replace the connector, then go to Step 5.
3	INSPECT FOR SHORT TO GROUND IN FRONT BODY CONTROL MODULE (FBCM) IG2 POWER SUPPLY OUTPUT CIRCUIT Verify that the front body control module (FBCM) connector is disconnected. Inspect for continuity between front body control module (FBCM) terminal 1C (wiring harness-side) and body ground. Is there continuity?	Yes	Go to the next step.
3		No	Go to Step 5.
4	INSPECT IG2 POWER SUPPLY OUTPUT CIRCUIT RELATED PARTS Inspect the following parts: Climate control unit (See CLIMATE CONTROL UNIT INSPECTION [MANUAL AIR CONDITIONER] .) (See CLIMATE CONTROL UNIT INSPECTION [FULL-AUTO AIR CONDITIONER] .) A/C relay (See RELAY INSPECTION .) Front seat warmer control unit (With front seat warmer) (See FRONT SEAT WARMER CONTROL UNIT INSPECTION .) Rear seat warmer control unit (With rear seat warmer) (See REAR SEAT WARMER CONTROL UNIT INSPECTION .) Are all parts normal?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between the following: Climate control unit-Front body control module (FBCM) terminal 1C A/C relay-Front body control module (FBCM) terminal 1C Front seat warmer control unit-Front body control module (FBCM) terminal 1C (With front seat warmer) Rear seat warmer control unit-Front body control module (FBCM) terminal 1C (With rear seat warmer) If there is a common connector: Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has a short to ground. Go to the next step.
4		No	Repair or replace the malfunctioning part, then go to the next step. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER] .) (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER] .) (See RELAY LOCATION .) (See FRONT SEAT REMOVAL/INSTALLATION .) (See REAR SEAT BACK FRAME REMOVAL/INSTALLATION .) (See REAR SEAT CUSHION REMOVAL/INSTALLATION .)
5	VERIFY THAT REPAIRS HAVE BEEN COMPLETED Always reconnect all disconnected connectors. Reconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .) Clear the DTC for the front body control module (FBCM) using the M-MDS. (See CLEARING DTC [FRONT BODY CONTROL MODULE (FBCM)] .) Retrieve the front body control module (FBCM) DTCs using the M-MDS. (See DTC INSPECTION [FRONT BODY CONTROL MODULE (FBCM)] .) Is the same DTC displayed?	Yes	Repeat the inspection from Step 1. If the malfunction recurs, replace the front body control module (FBCM). (See FRONT BODY CONTROL MODULE (FBCM) REMOVAL/INSTALLATION .) Go to the next step.
5		No	Go to the next step.
6	VERIFY IF OTHER DTCs DISPLAYED Are any other DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [FRONT BODY CONTROL MODULE (FBCM)] .)
6		No	DTC troubleshooting completed.