DTC P1935:00 [MZ-CD 1.6]


id0102g8863500

DTC P1935:00

Brake switch/Brake pedal position (BPP) switch signal error

DETECTION CONDITION
•  The PCM monitors the brake switch signal and the BPP switch signal. If there is no consistency between the brake switch signal and the BPP switch signal, the PCM determines that there is a malfunction.
POSSIBLE CAUSE
•  Communication error between instrument cluster and PCM
•  BPP switch connector or terminal malfunction
•  Brake switch connector or terminal malfunction
•  Short to ground in the wiring harness between brake switch terminal A and battery
•  Short to ground in the wiring harness between brake switch terminal B and PCM terminal 322
•  Brake switch malfunction
•  PCM connector or terminal malfunction
•  Open circuit in the wiring harness between brake switch terminal A and battery
•  Open circuit in the wiring harness between brake switch terminal B and PCM terminal 322
•  Short to ground in the wiring harness between BPP switch terminal B and Instrument cluster terminal 1B
•  BPP switch malfunction
•  Instrument cluster connector or terminal malfunction
•  Open circuit in the wiring harness between BPP switch terminal A and ground
•  Open circuit in the wiring harness between BPP switch terminal B and Instrument cluster terminal 1B
•  PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
•  Has the FREEZE FRAME DATA been recorded?
Yes
Go to the next step.
No
Record the FREEZE FRAME DATA on repair order, then go to the next step.
2
VERIFY RELATED REPAIR INFORMATION AVAILABILITY
•  Verify related service repair information availability.
•  Is any related repair information available?
Yes
Perform repair or diagnosis according to the available repair information.
•  If the vehicle is not repaired, go to the next step.
No
Go to the next step.
3
VERIFY STORED CAN COMMUNICATION DTC IN PCM AND INSTRUMENT CLUSTER
•  Retrieve the PCM and instrument cluster DTC using the M-MDS.
•  Is the CAN communication DTC present?
Yes
Go to the applicable DTC inspection.
No
Go to the next step.
4
INSPECT BRAKE SWITCH AND BPP SWITCH CONNECTORS CONDITION
•  Switch the ignition to off.
•  Disconnect the brake switch and BPP switch connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion)
•  Is there any malfunction?
Yes
Repair or replace the connector and/or terminals, then go to Step 14.
No
Go to the next step.
5
VERIFY WHETHER MALFUNCTION IS BRAKE SWITCH OR BPP SWITCH
•  Access the PCM PIDs BOO and BPA using the M-MDS.
•  Verify the BOO and BPA PIDs value.
•  Is the BOO and BPA PIDs value properly according to brake pedal conditions?
Yes
Go to Step 14.
No
If the BOO PID is not specified, go to the next step.
If the BPA PID is not specified, go to Step 10.
6
INSPECT BRAKE SWITCH CIRCUIT FOR SHORT TO GROUND
•  Switch the ignition to off.
•  Inspect for continuity between the following terminals (wiring harness-side) and body ground.
―  Brake switch terminal A
―  Brake switch terminal B
•  Is there continuity?
Yes
Repair or replace the wiring harness for a short to ground, then go to Step 14.
No
Go to the next step.
7
INSPECT BRAKE SWITCH
•  Perform the brake switch inspection.
•  Is the brake switch normal?
Yes
Go to the next step.
No
Replace the brake switch, then go to Step 14.
8
INSPECT PCM CONNECTOR CONDITION
•  Disconnect the PCM connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion)
•  Is there any malfunction?
Yes
Repair or replace the connector and/or terminals, then go to Step 14.
No
Go to the next step.
9
INSPECT BRAKE SWITCH CIRCUIT FOR OPEN CIRCUIT
•  Switch the ignition to off.
•  PCM and brake switch connector disconnected.
•  Inspect for continuity between following wiring harness-side connector:
―  Brake switch terminal A and battery
―  Brake switch terminal B and PCM terminal 322
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for an open circuit, then go to Step 14.
10
INSPECT BPP SWITCH CIRCUIT FOR SHORT TO GROUND
•  Switch the ignition to off.
•  Inspect for continuity between BPP switch terminal B (wiring harness-side) and body ground.
•  Is there continuity?
Yes
Repair or replace the wiring harness for a short to ground, then go to Step 14.
No
Go to the next step.
11
INSPECT BPP SWITCH
•  Perform the BPP switch.
•  Is the BPP switch normal?
Yes
Go to the next step.
No
Replace the BPP switch, then go to Step 14.
12
INSPECT INSTRUMENT CLUSTER CONNECTOR CONDITION
•  Disconnect the instrument cluster connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
•  Is there malfunction?
Yes
Repair or replace the terminal, then go to Step 14.
No
Go to the next step.
13
INSPECT BPP SWITCH CIRCUIT FOR OPEN CIRCUIT
•  Switch the ignition to off.
•  instrument cluster and BPP switch connector disconnected.
•  Inspect for continuity between following wiring harness-side connector:
―  BPP switch terminal A and ground
―  BPP switch terminal B and instrument cluster terminal 1B
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for an open circuit, then go to the next step.
14
VERIFY THAT DTC P1935:00 TROUBLESHOOTING IS COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Run the vehicle under the FREEZE FRAME DATA stored condition.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Operate the brake pedal while the vehicle runs and stops 8 times alternately.
•  Is same DTC present?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the PCM.
Go to the next step.
No
Go to the next step.
15
VERIFY AFTER REPAIR PROCEDURE
•  Perform the after repair procedure.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
No
DTC troubleshooting completed.