DTC 63

DTC 63: Parking Brake Switch System

Parking Brake Switch System Circuit <Vehicles without ABS>:

Parking Brake Switch System Circuit <Vehicles with ABS>:

CIRCUIT OPERATION
The AWD-ECU receives a signal from the parking brake switch whether the parking brake lever is pulled or released.

DTC SET CONDITIONS
DTC 63 is set when the parking brake switch is ON for more than 15 minutes with the vehicle speed above 15 km/h (9.3 mph).

TROUBLESHOOTING HINTS (THE MOST LIKELY CAUSES FOR THIS CODE TO BE SET ARE:)
^ Malfunction of parking brake switch
^ Damaged harness and connector
^ Malfunction of the ABS-ECU
^ Malfunction of the AWD-ECU

DIAGNOSIS
Required Special Tool:
^ MB991958: Scan Tool (M.U.T-III Sub Assembly)
^ MB991824: V.C.I.
^ MB991827: USB Cable
^ MB991911: Main Harness B

STEP 1. Using scan tool MB9911958, check data list item 62: Parking Brake Switch.

CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the LOCK (OFF) position before connecting or disconnecting scan tool MB991958.

1) Connect scan tool MB991958 to the data link connector.
2) Turn the ignition switch to ON position.
3) Set scan tool MB991958 to the data reading mode.
^ Item 62: Parking Brake Switch.
^ When the parking brake lever is pulled, ON is displayed.
^ When the parking brake lever is released, OFF is displayed.

4) Turn the ignition switch to the LOCK (OFF) position.
Q: Is the switch operating properly?
YES: It can be assumed that this malfunction is intermittent.
NO: Go to Step 2.

STEP 2. Measure the voltage at AWD-ECU connector C-138 by backprobing.

1) Turn the ignition switch to the ON position.
2) Measure the voltage between AWD-ECU connector C-138 terminal 37 and ground by backprobing.
^ When the parking brake lever is released, voltage should measure battery positive voltage.
^ When the parking brake lever is pulled, voltage should measure less than 1.0 volt.

3) Turn the ignition switch to the LOCK (OFF) position.
Q: Is the check result normal?
YES: Go to Step 3.
NO: Go to Step 5.

STEP 3. Check AWD-ECU connector C-138 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are the connector and terminals in good condition?
YES: Go to Step 4.
NO: Repair or replace the damaged components.

STEP 4. Using scan tool MB9911958, check data list item 62: Parking Brake Switch.

CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the LOCK (OFF) position before connecting or disconnecting scan tool MB991958.

1) Connect scan tool MB991958 to the data link connector.
2) Turn the ignition switch to ON position.
3) Set scan tool MB991958 to the data reading mode.
^ Item 62: Parking Brake Switch.
^ When the parking brake lever is pulled, ON is displayed.
^ When the parking brake lever is released, OFF is displayed.

4) Turn the ignition switch to the LOCK (OFF) position.
Q: Is the switch operating properly?
YES: It can be assumed that this malfunction is intermittent.
NO: Replace the AWD-ECU

STEP 5. Check ABS-ECU connector B-118 , joint connector (4) C-23, intermediate connector C-124, AWD-ECU connector C-138 and parking brake switch connector D-28 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are the connectors and terminals in good condition?
YES: Go to Step 6.
NO: Repair or replace the damaged components.

STEP 6. Check the harness for open circuit or short circuit to ground between AWD-ECU connector C-138 terminal 37 and parking brake switch connector D-28 terminal 1.

Q: Is the harness wire in good condition?
YES : Go to Step 4.
YES : Go to Step 7.
NO: Repair or replace the harness wire.

STEP 7. Check the harness for short circuit to ground between ABS-ECU connector B-118 terminal 1 and intermediate connector C-124 terminal 2.

Q: Is the harness wire in good condition?
YES: Go to Step 4.
NO: Repair or replace the harness wire.