Diagnostic procedure

WARNING: This page is about a different car, the 2016 Mazda CX-5. However, it is still accessible from the selected car via links, so may be relevant.

STEP	INSPECTION		ACTION
1	VERIFY OPEN OR SHORT CIRCUIT IN BRAKE SWITCH SIGNAL Switch the ignition ON (engine off). Measure the voltage between the PCM connector terminal 2G (vehicle harness-side) and body ground when the brake pedal is depressed and released. Voltage Brake pedal depressed: B+ Brake pedal released: 1 V or less Is the voltage normal?	Yes	Go to Step 5.
1		No	If it is B+ under any condition, then go to the next step. If it is 1 V or less under any condition, then go to Step 3.
2	INSPECT BRAKE SWITCH SIGNAL FOR SHORT TO POWER SUPPLY CIRCUIT Disconnect the brake switch connector. Measure voltage between the brake switch connector terminal D (vehicle harness-side) and body ground. Is the voltage 1 V or less ?	Yes	Go to Step 4.
2		No	Repair or replace the wiring harness between the PCM and brake switch, then go to Step 7
3	INSPECT BRAKE SWITCH SIGNAL FOR OPEN CIRCUIT Disconnect the PCM connectors. Disconnect the brake switch connector. Inspect continuity between the PCM and brake switch as follows. PCM connector terminal 2G (vehicle harness-side) and brake switch connector terminal D (vehicle harness-side) Is there continuity?	Yes	Go to the next step.
3		No	Repair or replace the wiring harness between the PCM and brake switch, then go to Step 7.
4	INSPECT BRAKE SWITCH Inspect the brake switch. (See BRAKE SWITCH INSPECTION .) Is the brake switch normal?	Yes	Go to the next step.
4		No	Replace the brake switch, then go to the next step. (See BRAKE PEDAL REMOVAL/INSTALLATION .)
5	PERFORM REAR BODY CONTROL MODULE (RBCM) DTC INSPECTION Reconnect all disconnected connectors. Using the M-MDS, perform the DTC inspection for the rear body control module (RBCM). (See DTC INSPECTION [REAR BODY CONTROL MODULE (RBCM)] .) Are any DTCs detected?	Yes	Go to applicable DTC inspection. (See DTC TABLE [REAR BODY CONTROL MODULE (RBCM)] .)
5		No	Go to the next step.
6	PERFORM PCM DTC INSPECTION Using the M-MDS, perform the DTC inspection for the rear body control module (RBCM). (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .) Are any DTCs detected?	Yes	Go to applicable DTC inspection. (See DTC TABLE [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .)
6		No	Go to the next step.
7	VERIFY THAT THE SAME DTC IS NOT PRESENT Reconnect all disconnected connectors. Clear the DTCs from the memory. (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)] .) Start the engine and drive the vehicle at 20 km/h {12 mph} or more. Are the same DTCs present?	Yes	Repeat the inspection from Step 1. If the malfunction recurs, replace the DSC HU/CM, then go to the next step. (See DSC HU/CM REMOVAL/INSTALLATION .)
7		No	Go to the next step.
8	VERIFY THAT NO OTHER DTCS ARE PRESENT Are any other DTCs output?	Yes	Go to the applicable DTC inspection. (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)] .)
8		No	DTC troubleshooting completed.