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

id09021c405400

DETECTION CONDITION
Brake switch and brake switch2 link malfunction
POSSIBLE CAUSE
•  STOP 5 A fuse malfunction
•  Connector or terminal malfunction
•  Short circuit to ground or power supply in wiring harness between brake switch connector terminal C and keyless control module connector terminal 3E
•  Short circuit to ground or power supply in wiring harness between PCM connector terminal 1AF and keyless control module connector terminal 3E
•  Short circuit to ground or power supply in wiring harness between brake switch connector terminal D and keyless control module connector terminal 3S
•  Open circuit in wiring harness between brake switch connector terminal A and battery
•  Open circuit in wiring harness between brake switch connector terminal B and body ground
•  Brake switch malfunction
•  PCM malfunction
•  Keyless control module malfunction

Diagnostic Procedure

Step

Inspection

Action
1
INSPECT STOP 5 A FUSE
•  Switch the ignition to off.
•  Disconnect the negative battery cable.
•  Remove the STOP 5 A fuse.
•  Inspect the fuse.
•  Is the STOP 5 A fuse normal?
Yes
Go to the next step.
No
Replace the STOP 5 A fuse.
After replacement, go to Step 10.
2
INSPECT BRAKE SWITCH CONNECTOR CONDITION
•  Disconnect the brake switch connector.
•  Inspect the connector and terminals (corrosion, damage, pin disconnection).
•  Is the connector normal?
Yes
Go to the next step.
No
Repair/replace the connector or terminal.
After repair procedure, go to Step 10.
3
INSPECT BRAKE SWITCH
•  Inspect the brake switch.
•  Is the brake switch normal?
Yes
Go to the next step.
No
Replace the brake switch.
(See BRAKE PEDAL REMOVAL/INSTALLATION.)
After replacement, go to Step 10.
4
INSPECT PCM CONNECTOR CONDITION
•  Disconnect the PCM connector.
•  Inspect the connector and terminals (corrosion, damage, pin disconnection).
•  Is the connector normal?
Yes
Go to the next step.
No
Repair/replace the connector or terminal.
After repair procedure, go to Step 10.
5
INSPECT KEYLESS CONTROL MODULE CONNECTOR CONDITION
•  Disconnect the keyless control module connector.
•  Inspect the connector and terminals (corrosion, damage, pin disconnection).
•  Is the connector normal?
Yes
Go to the next step.
No
Repair/replace the connector or terminal.
After repair procedure, go to Step 10.
6
INSPECT BRAKE SWITCH CIRCUIT FOR SHORT CIRCUIT TO GROUND
•  Inspect for continuity between the following connector terminals and body ground.
―  Brake switch connector terminal C
―  Brake switch connector terminal D
•  Is there continuity?
Yes
Repair/replace the wiring harness.
After repair procedure, go to Step 10.
No
Go to the next step.
7
INSPECT BRAKE SWITCH CIRCUIT FOR SHORT CIRCUIT TO POWER SUPPLY
•  Reconnect the negative battery cable.
•  Switch the ignition to ON.
•  Measure the voltage at following connector terminals.
―  Brake switch connector terminal C
―   Brake switch connector terminal D
•  Can the voltage be measured?
Yes
Repair/replace the wiring harness.
After repair procedure, go to Step 10.
No
Go to the next step.
8
INSPECT BRAKE SWITCH CIRCUIT FOR OPEN CIRCUIT
•  Inspect for continuity between the following connector terminals.
―  Brake switch connector terminal A—battery positive terminal
―  Brake switch connector terminal B—body ground
•  Is there continuity?
Yes
Go to the next step.
No
Repair/replace the malfunctioning vehicle wiring harness.
After repair procedure, go to Step 10.
9
INSPECT PCM
•  Reconnect the PCM connector.
•  Measure the voltage at PCM connector terminal 1AF.
•  Is the voltage normal?
Yes
Go to the next step.
No
Replace the PCM.
(See PCM REMOVAL/INSTALLATION [L8, LF, L5])
After replacement, go to the next step.
10
VERIFY DTC
•  Install the STOP 5 A fuse.
•  Reconnect the disconnected connectors and the negative battery cable.
•  Clear DTC using the M-MDS.
•  Verify DTC 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.
(See KEYLESS CONTROL MODULE REMOVAL/INSTALLATION [ADVANCED KEYLESS ENTRY AND PUSH BUTTON START SYSTEM].)
Go to the next step.
No
Go to the next step.
11
VERIFY THAT NO OTHER DTCs ARE PRESENT
•  Are there other DTCs output?
Yes
Perform the corresponding DTC inspection.
No
DTC troubleshooting completed.