Inspection Procedure 2: When the Parking Brake Lever Is Pulled, the Brake Warning Light Does Not Illuminate

INSPECTION PROCEDURE 2: When the Parking Brake Lever is Pulled, the Brake Warning Light does not Illuminate.





TECHNICAL DESCRIPTION (COMMENT)
The parking brake switch turns on and off by operating the parking brake lever, and the brake warning light illuminates and goes out, indicating the operating status of parking brake to a driver.

TROUBLESHOOTING HINTS (THE MOST LIKELY CAUSES FOR THIS CASE:)
^ Damaged wiring harness or connector
^ Parking brake switch defective
^ Combination meter defective

DIAGNOSIS

Required Special Tools:
^ MB991958: Scan Tool (M.U.T.-III Sub Assembly)
^ MB991824: Vehicle Communication Interface (V.C.I.)
^ MB991827: M.U.T.-III USB Cable
^ MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, check combination meter actuator test.

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 the "ON" position.
3) Turn the parking brake switch and brake fluid level switch to "OFF" position.
4) Set scan tool MB991958 to the actuator test mode.
^ Item 13: Indicator lamp 4: ON
^ The brake warning light illuminates.
^ Item 13: Indicator lamp 4: OFF
^ The brake warning light goes out.
5) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the check result normal?
YES: Go to Step 2.
NO: Replace the combination meter.

STEP 2. Check the parking brake switch.

Q: Is the parking brake switch normal?
YES: Go to Step 3.
NO: Replace the parking brake switch. Then go to Step 7.

STEP 3. Check parking brake switch connector C-122, intermediate connector C-23 and combination meter connector C-04 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 4.
NO: Repair or replace the faulty connector. Then go to Step 7.

STEP 4. Check the harness wire parking brake switch connector C-122 terminal 1 and combination meter connector C-04 terminal 4 for damage.

Q: Are the harness wires in good condition?
YES: Go to Step 5.
NO: Repair the damaged harness wire. Then go to Step 7.

STEP 5. Check the parking brake switch ground for damage.

Q: Is the parking brake switch ground in good condition?
YES: Go to Step 6.
NO: Repair the ground or damaged harness wire. Then go to Step 7.

STEP 6. Retest the system.

Q: Does the brake warning light illuminate when the parking brake lever is pull?
YES: It can be assumed that this malfunction is intermittent..
NO: Replace the combination meter.

STEP 7. Retest the system.

Q: Does the brake warning light illuminate when the parking brake lever is pulled?
YES: The procedure is complete.
NO: Return to Step 1.