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

id09021c405400

DESCRIPTION

Erratic 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 or short to ground in brake switch power supply circuit
―  Short to ground in wiring harness between battery positive terminal and brake switch terminal A
―  STOP 15 A fuse malfunction
―  Open circuit in wiring harness between battery positive terminal and brake switch terminal A
•  Open circuit in wiring harness between the following:
―  Brake switch terminal B—Body ground
•  Keyless control module connector or terminals malfunction
•  Short to ground in wiring harness between the following terminals:
―  Brake switch terminal D—Keyless control module terminal 3R
―  Brake switch terminal C—Keyless control module terminal 4W
•  Short to power supply in wiring harness between the following terminals:
―  Brake switch terminal D—Keyless control module terminal 3R
•  Open circuit in wiring harness between the following terminals:
―  Brake switch terminal D—Keyless control module terminal 3R
―  Brake switch terminal C—Keyless control module terminal 4W
•  Brake switch malfunction
•  Keyless control module malfunction

Diagnostic Procedure

Step

Inspection

Action
1
INSPECT BRAKE SWITCH CONNECTOR AND TERMINALS
•  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 8.
No
Go to the next step.
2
INSPECT BRAKE SWITCH POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT OR SHORT TO GROUND
•  Brake switch connector is disconnected.
•  Reconnect the negative battery cable.
•  Switch the ignition to ON.
•  Measure the voltage at the following terminal (wiring harness-side):
―  Brake switch terminal A
•  Is the voltage B+?
Yes
Go to the next step.
No
Inspect the STOP 15 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 8.
3
INSPECT BRAKE SWITCH GROUND CIRCUIT FOR OPEN CIRCUIT
•  Brake switch connector is disconnected.
•  Switch the ignition to off.
•  Disconnect the negative battery cable.
•  Inspect for continuity between the following terminal (wiring harness-side) and body ground:
―  Brake switch terminal B
•  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 8.
4
INSPECT KEYLESS CONTROL MODULE CONNECTOR AND TERMINALS
•  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 8.
No
Go to the next step.
5
INSPECT BRAKE SWITCH CIRCUIT FOR SHORT TO GROUND
•  Brake switch and keyless control module connectors are disconnected.
•  Inspect for continuity between the following terminals (wiring harness-side) and body ground:
―  Brake switch terminal D
―  Brake switch terminal C
•  Is there continuity?
Yes
Repair or replace the wiring harness for a possible short to ground, then go to Step 8.
No
Go to the next step.
6
INSPECT BRAKE SWITCH CIRCUIT FOR SHORT TO POWER SUPPLY
•  Brake switch and keyless control module connectors are disconnected.
•  Reconnect the negative battery cable.
•  Switch the ignition to ON.
•  Measure the voltage at the following terminal (wiring harness-side):
―  Keyless control module terminal 3R
•  Is there any voltage?
Yes
Repair or replace the wiring harness for a possible short to power supply, then go to Step 8.
No
Go to the next step.
7
INSPECT BRAKE SWITCH CIRCUIT FOR OPEN CIRCUIT
•  Brake switch 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 D—Keyless control module terminal 3R
―  Brake switch terminal C—Keyless control module terminal 4W
•  Is there continuity?
Yes
Replace the brake switch, then go to the next step.
(See BRAKE PEDAL REMOVAL/INSTALLATION [L.H.D.].)
(See BRAKE PEDAL REMOVAL/INSTALLATION [R.H.D.].)
No
Repair or replace the wiring harness for a possible open circuit, then go to the next step.
8
VERIFY TROUBLESHOOTING COMPLETED
•  Make sure to reconnect the disconnected connectors.
•  Reconnect the negative battery cable.
•  Operate the advanced key to activate the keyless control module.
•  Clear the DTC from the keyless control module using the M-MDS.
•  Operate the advanced key to activate the keyless control module.
•  Perform the advanced keyless entry and push button start system DTC inspection using the M-MDS.
•  Is the same DTC present?
Yes
Replace the keyless control module, then go to the next step.
(See KEYLESS CONTROL MODULE REMOVAL/INSTALLATION.)
No
Go to the next step.
9
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.