INSPECTION PROCEDURE 3: When the Parking Brake Lever is Released, the Brake Warning Light does not Turn Off: 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

1. 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.
   Fig 1: Connecting Scan Tool MB991958 To Data Link Connector
   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   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 (Refer to COMBINATION METER ASSEMBLY ).

2. STEP 2. Check the parking brake switch. 

   Refer to PARKING BRAKE SWITCH CHECK  .

   Q: Is the parking brake switch normal? 

   YES  : Go to Step 3.

   NO  : Replace the parking brake switch. Then go to Step  7.

3. 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. (Refer to HARNESS CONNECTOR INSPECTION ). Then go to Step  7.

4. 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.

5. 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.

6. STEP 6. Retest the system. 

   Q: Does the brake warning light illuminate when the parking brake lever is pulled? 

   YES  : It can be assumed that this malfunction is intermittent. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).

   NO  : Replace the combination meter (Refer to COMBINATION METER ASSEMBLY ).

7. 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.