DTC C0040:29 [ADVANCED KEYLESS ENTRY AND PUSH BUTTON START SYSTEM]

id09021c405400

DESCRIPTION

Error signal of brake switch
DETECTION CONDITION
•  A combination of the brake switch 1 and 2 signals is abnormal.
POSSIBLE CAUSE
•  Brake switch connector or terminals malfunction
•  Open circuit in wiring harness between brake switch terminal B and body ground
•  Open circuit or short to ground in brake switch power supply circuit
―  Short to ground in wiring harness between brake switch terminal A and STOP 10 A fuse
―  STOP 10 A fuse malfunction
―  Open circuit in wiring harness between brake switch terminal A and battery positive terminal
•  PCM connector or terminals malfunction
•  Keyless control module connector or terminals malfunction
•  Short to ground in wiring harness between the following terminals:
―  Brake switch terminal C—PCM terminal 1AF
―  Brake switch terminal C—Keyless control module terminal 3E
―  Brake switch terminal D—Keyless control module terminal 3S
•  Short to power supply in wiring harness between the following terminals:
―  Brake switch terminal C—PCM terminal 1AF
―  Brake switch terminal C—Keyless control module terminal 3E
―  Brake switch terminal D—Keyless control module terminal 3S
•  Open circuit in wiring harness between the following terminals:
―  Brake switch terminal C—PCM terminal 1AF
―  Brake switch terminal C—Keyless control module terminal 3E
―  Brake switch terminal D—Keyless control module terminal 3S
•  Brake switch malfunction
•  PCM malfunction
•  Keyless control module malfunction

Diagnostic Procedure

Step

Inspection

Action
1
INSPECT BRAKE SWITCH CONNECTOR CONDITION
•  Switch the ignition to off.
•  Disconnect the negative battery cable.
•  Disconnect the brake switch connector.
•  Inspect the connector and terminals (corrosion, damage, pin disconnection).
•  Is there any malfunction?
Yes
Repair or replace the connector or terminals, then go to Step 10.
No
Go to the next step.
2
INSPECT BRAKE SWITCH GROUND CIRCUIT FOR OPEN CIRCUIT
•  Brake switch connector is disconnected.
•  Inspect for continuity between brake switch terminal B (wiring harness-side) and body ground.
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a possible open circuit, then go to Step 10.
3
INSPECT BRAKE SWITCH POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT OR SHORT TO GROUND
•  Brake switch connector is disconnected.
•  Reconnect the negative battery cable.
•  Measure the voltage at the brake switch terminal A (wiring harness-side).
•  Is the voltage B+?
Yes
Go to the next step.
No
Inspect the STOP 10 A fuse.
•  If the fuse is melt:
―  Repair or replace the wiring harness for a possible short to ground.
―  Replace the fuse.
•  If the fuse is deterioration:
―  Replace the fuse.
•  If the fuse is normal:
―  Repair or replace the wiring harness for a possible open circuit.
Go to Step 10.
4
INSPECT PCM CONNECTOR CONDITION
•  Disconnect the negative battery cable.
•  Disconnect the PCM connector.
•  Inspect the connector and terminals (corrosion, damage, pin disconnection).
•  Is there any malfunction?
Yes
Repair or replace the connector or terminals, then go to Step 10.
No
Go to the next step.
5
INSPECT KEYLESS CONTROL MODULE CONNECTOR CONDITION
•  Disconnect the keyless control module connector.
•  Inspect the connector and terminals (corrosion, damage, pin disconnection).
•  Is there any malfunction?
Yes
Repair or replace the connector or terminals, then go to Step 10.
No
Go to the next step.
6
INSPECT BRAKE SWITCH CIRCUIT FOR SHORT TO GROUND
•  Brake switch, PCM and keyless control module connectors are disconnected.
•  Inspect for continuity between the following terminals (wiring harness-side) and body ground:
―  Brake switch terminal C
―  Brake switch terminal D
•  Is there continuity?
Yes
Repair or replace the wiring harness for a possible short to ground, then go to Step 10.
No
Go to the next step.
7
INSPECT BRAKE SWITCH CIRCUIT FOR SHORT TO POWER SUPPLY
•  Brake switch, PCM and keyless control module connectors are disconnected.
•  Reconnect the negative battery cable.
•  Switch the ignition to ON.
•  Measure the voltage at the following terminals (wiring harness-side):
―  Brake switch terminal C
―  Brake switch terminal D
•  Is there any voltage?
Yes
Repair or replace the wiring harness for a possible short to power supply, then go to Step 10.
No
Go to the next step.
8
INSPECT BRAKE SWITCH CIRCUIT FOR OPEN CIRCUIT
•  Brake switch, PCM and keyless control module connectors are disconnected.
•  Switch the ignition to off.
•  Disconnect the negative battery cable.
•  Inspect for continuity between the following terminals (wiring harness-side):
―  Brake switch terminal C—PCM terminal 1AF
―  Brake switch terminal C—Keyless control module terminal 3E
―  Brake switch terminal D—Keyless control module terminal 3S
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a possible open circuit, then go to Step 10.
9
INSPECT PCM
•  Make sure to reconnect the disconnected connectors.
•  Reconnect the negative battery cable.
•  Measure the voltage at the PCM terminal 1AF (wiring harness-side).
•  Is the voltage normal?
Yes
Replace the brake switch, then go to the next step.
(See BRAKE PEDAL REMOVAL/INSTALLATION.)
Caution
•  Inspect the brake switch with it installed to the brake pedal, otherwise the brake switch may not operate normally. If the brake switch is removed from the brake pedal, replace the brake switch with a new one.
No
Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [MZR 1.8, MZR 2.0, MZR 2.5].)
(See PCM REMOVAL/INSTALLATION [MZR 2.0 DISI].)
10
VERIFY TROUBLESHOOTING COMPLETED
•  Make sure to reconnect the disconnected connectors.
•  Reconnect the negative battery cable.
•  Clear the DTC from the keyless control module using the M-MDS.
•  Perform the advanced keyless entry and push button start system DTC inspection using the M-MDS.
•  Is the same DTC present?
Yes
Repeat the inspection from Step 1.
If the malfunction recurs, replace the keyless control module, then go to the next step.
(See KEYLESS CONTROL MODULE REMOVAL/INSTALLATION [ADVANCED KEYLESS ENTRY AND PUSH BUTTON START SYSTEM].)
No
Go to the next step.
11
VERIFY THAT NO OTHER DTCs ARE PRESENT
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [ADVANCED KEYLESS ENTRY AND PUSH BUTTON START SYSTEM].)
No
DTC troubleshooting completed.