Symptom Related Diagnostic Procedures
SYMPTOM CHARTSymptom Chart:
SYMPTOM PROCEDURES
INSPECTION PROCEDURE 1: None of the Heated Door Mirrors Operate
Door Mirror Relay Circuit (Part 1):
Door Mirror Relay Circuit (Part 2):
CIRCUIT OPERATION
If none of the door mirror heaters operate normally, it may be due to a malfunction in the rear window defogger system.
TROUBLESHOOTING HINTS
- Malfunction of the rear window defogger system
- The wiring harness or connectors may have loose, corroded or damaged terminals, or terminals pushed back in the connector.
DIAGNOSIS
Required Special Tools:
- MB991223: Test Harness Set
STEP 1. Check the rear window defogger.
Check that the rear window defogger works normally.
1. Turn the ignition switch to the "ON" position.
2. Push the rear window defogger switch to operate the defogger.
Q: Does the defogger work normally?
YES: Go to Step 2.
NO: Because of malfunction of the rear window defogger, carry out the troubleshooting (Refer to heater and A/C and ventilation, Manual A/C Diagnosis).
STEP 2. Check the door mirror (RH) connector E-03 and rear window defogger relay connector C-306 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q: Is the door mirror (RH) connector E-03 and rear window defogger relay connector C-306 in good condition?
YES: Go to Step 3.
NO: Repair or replace the damaged component(s). Refer to general (electrical), Harness Connector Inspection. Check if the door mirrors works normally.
STEP 3. Check the wiring harness between the door mirror (RH) connector E-03 (terminal 1) and rear window defogger relay connector C-306 (terminal 3).
NOTE: Also check the joint connector (2) C-102, joint connector (3) C-103 and intermediate connector C-117 for loose, corroded or damaged terminals, or terminals pushed back in the connector. If the joint connector (2) C-102, joint connector (3) C-103 and intermediate connector C-117 is damaged, repair or replace the damaged component(s) as described in general (electrical), Harness Connector Inspection.
Q: Is the wiring harness between door mirror (RH) connector E-03 (terminal 1) and rear window defogger relay connector C-306 (terminal 3) in good condition?
YES: Go to step 4.
NO: Repair the wiring harness as necessary. Check if all heated door mirrors work normally.
STEP 4. Check door mirror (LH) connector E-01.
Q: Is the door mirror (LH) connector E-01 in good condition?
YES: Go to Step 5.
NO: Repair or replace the damaged component(s). Check if all heated door mirrors work normally.
STEP 5. Check the wiring harness between door mirror (LH) connector E-01 (terminal 1) and rear window defogger relay connector C-306 (terminal 3).
NOTE: Also check the joint connector (2) C-102, joint connector (3) C-103 and intermediate connector C-129 for loose, corroded or damaged terminals, or terminals pushed back in the connector. If the joint connector (2) C-102, joint connector (3) C-103 and intermediate connector C-129 is damaged, repair or replace the damaged component(s) as described in general (electrical), Harness Connector Inspection.
Q: Is the wiring harness between door mirror (LH) connector E-01 (terminal 1) and rear window defogger relay connector C-306 (terminal 3) in good condition?
YES: The procedure is complete.
NO: Repair the wiring harness as necessary. Check if all heated door mirrors work normally.
INSPECTION PROCEDURE 2: Either of the Heated Door Mirror does not Operate
Door Mirror Relay Circuit (Part 1):
Door Mirror Relay Circuit (Part 2):
CIRCUIT OPERATION
If either of the heated door mirror does not operate normally, it may be due to malfunctions in the heated door mirror circuit or door mirror.
TROUBLESHOOTING HINTS
- Malfunction of the heated door mirror circuit
- Malfunction of the door mirror
- The wiring harness or connectors may have loose, corroded or damaged terminals, or terminals pushed back in the connector.
DIAGNOSIS
Required Special Tools:
- MB991223: Test Harness Set
STEP 1. Verify the operation of each heated door mirror.
Q: Which door mirror does not heat?
Door mirror (LH) : Go to Step 2.
Door mirror (RH) : Go to Step 8.
STEP 2. Check door mirror (LH) connector E-01 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q: Is door mirror (LH) connector E-01 in good condition?
YES: Go to Step 3.
NO: Repair or replace the damaged component(s). Refer to general (electrical), Harness Connector Inspection. And then check to see that the heater function of the door mirror (LH) operates normally.
STEP 3. Check the heater of the door mirror (LH).
CAUTION: When relocating the car between locations of extremely different temperatures (warm and cold), leave the car in a location for a while to adapt to the temperature prior to checking it.
Check to see that the resistance between terminal 1 and 5 of the door mirror (LH) connector E-01.
- The resistance should be 8.4 ± 1.2 Ohms at 25°C (77°F).
Q: Is the resistance normal?
YES: Go to Step 4.
NO: Replace the door mirror (LH). And then check to see that the heater function of the door mirror (LH) is operating normally.
STEP 4. Check the ground circuit between door mirror (LH) connector E-01 and ground for open circuit. Measure the resistance at door mirror (LH) connector E-01.
1. Disconnect door mirror (LH) connector E-01 and check at the wiring harness side connector.
2. Measure the resistance value between terminal 1 and ground.
- The resistance should be 2 ohms or less.
Q: Is the measured resistance 2 ohms or less?
YES: Go to Step 6.
NO: Go to Step 5.
STEP 5. Check the wiring harness between door mirror (LH) connector E-01 (terminal 5) and ground.
NOTE: Also check the joint connector (2) C-102, joint connector (3) C-103 and intermediate connector C-128 and C-129 for loose, corroded or damaged terminals, or terminals pushed back in the connector. If the joint connector (2) C-102, joint connector (3) C-103 and intermediate connector C-128 and C-129 is damaged, repair or replace the damaged component(s) as described in general (electrical), Harness Connector Inspection.
Q: Is the wiring harness between door mirror (LH) connector E-01 (terminal 1) and ground in good condition?
YES: No action is necessary and testing is complete.
NO: The wiring harness may be damaged. Repair the wiring harness as necessary. And then check to see that the heater function of the door mirror (LH) operates normally.
STEP 6. Check rear window defogger relay connector C-306 for loose, corroded or damaged terminal, or terminals pushed back in the connector.
Q: Is rear window defogger relay connector C-306 in good condition?
YES: Go to Step 7.
NO: Repair or replace the damaged component(s). Refer to general (electrical), Harness Connector Inspection. And then check to see that the heater function of the door mirror (LH) operates normally.
STEP 7. Check the wiring harness between door mirror (LH) connector E-01 (terminal 1) and rear window defogger relay connector C-306 (terminal 3).
NOTE: Also check the joint connector (2) C-102, joint connector (3) C-103 and intermediate connector C-129 for loose, corroded or damaged terminals, or terminals pushed back in the connector. If the joint connector (2) C-102, joint connector (3) C-103 and intermediate connector C-129 is damaged, repair or replace the damaged component(s) as described in general (electrical), Harness Connector Inspection.
Q: Is the wiring harness between door mirror (LH) connector E-01 (terminal 1) and rear window defogger relay connector C-306 (terminal 3) in good condition?
YES: No action is necessary and testing is complete.
NO: Repair the wiring harness as necessary. And then check to see that the heater function of the door mirror (LH) operates normally.
STEP 8. Check the door mirror (RH) connector E-03 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q: Is the door mirror (RH) connector E-03 in good condition?
YES: Go to Step 9.
NO: Repair or replace the damaged component(s). Refer to general (electrical), Harness Connector Inspection. And then check to see that the heater function of the door mirror (RH) operates normally.
STEP 9. Check the heater function of the door mirror (RH).
CAUTION: When relocating the car between locations of extremely different temperatures (warm and cold), leave the car in a location for a while to adapt to the temperature prior to checking it.
Check to see that the resistance between terminal 1 and 5 of the door mirror (RH) connector E-03.
- The resistance should be 8.4 ± 1.2 Ohms at 25°C (77°F).
Q: Is the resistance normal?
YES: Go to Step 10.
NO: Replace the door mirror (RH). And then check to see that the heater function of the door mirror (RH) operates normally.
STEP 10. Check the ground circuit between door mirror (RH) connector E-03 and ground for open circuit. Measure the resistance at door mirror (RH) connector E-03.
1. Disconnect door mirror (RH) connector E-03, and check at the wiring harness side connector.
2. Measure the resistance value between terminal 1 and ground.
- The resistance should be 2 ohms or less.
Q: Is the measured resistance 2 ohms or less?
YES: Go to Step 12.
NO: Go to Step 11.
STEP 11. Check the wiring harness between door mirror (RH) connector E-03 (terminal 5) and ground.
NOTE: Also check the joint connector (2) C-102, joint connector (3) C-103 and intermediate connector C-116 and C-117 for loose, corroded or damaged terminals, or terminals pushed back in the connector. If the joint connector (2) C-102, joint connector (3) C-103 and intermediate connector C-116 and C-117 is damaged, repair or replace the damaged component(s) as described in general (electrical), Harness Connector Inspection.
Q: Is the wiring harness between door mirror (RH) connector E-03 (terminal 1) and ground in good condition?
YES: No action is necessary and testing is complete.
NO: The wiring harness may be damaged. Repair the wiring harness as necessary. And then check to see that the heater function of the door mirror (RH) operates normally.
STEP 12. Check rear window defogger relay connector C-306 for loose, corroded or damaged terminal, or terminals pushed back in the connector.
Q: Is rear window defogger relay connector C-306 in good condition?
YES: Go to Step 13.
NO: Repair or replace the damaged component(s). Refer to general (electrical), Harness Connector Inspection. And then check to see that the heater function of the door mirror (RH) operates normally.
STEP 13. Check the wiring harness between door mirror (RH) connector E-03 (terminal 1) and rear window defogger relay connector C-306 (terminal 3).
NOTE: Also check the joint connector (2) C-102, joint connector (3) C-103 and intermediate connector C-117 for loose, corroded or damaged terminals, or terminals pushed back in the connector. If the joint connector (2) C-102, joint connector (3) C-103 and intermediate connector C-117 is damaged, repair or replace the damaged component(s) as described in general (electrical), Harness Connector Inspection.
Q: Is the wiring harness between door mirror (RH) connector E-03 (terminal 1) and rear window defogger relay connector C-306 (terminal 3) in good condition?
YES: No action is necessary and testing is complete.
NO: Repair the wiring harness as necessary. And then check to see that the heater function of the door mirror (RH) operates normally.