Inspection Procedure 1: Indicator does not Illuminate.: Diagnosis

Required Special Tools: 

• MB991223: Harness Set

1. STEP 1. Check that the indicator illuminates. 
   1. Turn the ignition switch to "ACC" or "ON" position.
   2. Make sure the green indicator on.
   3. If it's not, press the display switch for more than 6 seconds, less than 9 seconds, until the indicator illuminates.

   Q: Does the indicator illuminate? 

   YES  : There is no action to be taken.

   NO:  Go to Step 2.

   Fig 1: Checking Indicator

   Courtesy of DAIMLERCHRYSLER CORPORATION
2. STEP 2. Check the inside rear view mirror power supply circuit at the inside rear view mirror connector D-04. 
   1. Disconnect the inside rear view mirror connector D-04 and measure the harness side.
   2. Turn the ignition switch to "ON" position.
   3. Measure the voltage between terminal 10 and ground.
      • The measured voltage should measure approximately 12 volts (battery positive voltage).

   Q: Does the measured voltage correspond with this range? 

   YES  : Go to  Step 5.

   NO:  Go to Step 3.

   Fig 2: Disconnecting Inside Rear View Mirror Connector D-04

   Courtesy of DAIMLERCHRYSLER CORPORATION
3. STEP 3. Check the inside rear view mirror connector D-04 for damage. 

   Q: Is the inside rear view mirror connector D-04 in good condition? 

   YES  : Go to Step 4.

   NO:  Repair or replace the connector. Then go to  Step 8.

   Fig 3: Checking Inside Rear View Mirror Connector

   Courtesy of DAIMLERCHRYSLER CORPORATION
4. STEP 4. Check the wiring harness between the inside rear view mirror connector D-04 (terminal 10) and the ignition switch (IG2). 
   Fig 4: Checking Wiring Harness Between Inside Rear View Mirror Connector D-04

   Courtesy of DAIMLERCHRYSLER CORPORATION
   NOTE: Also check junction block connector C-311 and C-302. If junction block connector C-311 or C-302 is damaged, repair or replace the connector. Refer to , HARNESS CONNECTOR INSPECTION .

   Q: Is the wiring harness between the automatic anti-glare inside mirror D-04 (terminal 10) and the ignition switch in good condition? 

   YES  : Go to  Step 8.

   NO:  Repair the wiring harness. Then go to  Step 8.

   Fig 5: Checking Junction Block Connector C-311 And C-302

   Courtesy of DAIMLERCHRYSLER CORPORATION
5. STEP 5. Check the inside rear view mirror ground circuit at the inside rear view mirror connector D-04 (terminal 3). 
   1. Disconnect the inside rear view mirror connector D-04 and measure the harness side.
   2. Measure the resistance between terminal 3 and ground.
      • The measured value should be approximately 2 ohms.

   Q: Does the measured resistance correspond with this range? 

   YES  : Go to  Step 8.

   NO:  Go to Step 6.

   Fig 6: Disconnecting Inside Rear View Mirror Connector D-04

   Courtesy of DAIMLERCHRYSLER CORPORATION
6. STEP 6. Check the inside rear view mirror connector D-04 for damage. 

   Q: Is the inside rear view mirror connector D-04 in good condition? 

   YES  : Go to Step 7.

   NO:  Repair or replace the connector. Then go to  Step 8.

   Fig 7: Checking Inside Rear View Mirror Connector D-04

   Courtesy of DAIMLERCHRYSLER CORPORATION
7. STEP 7. Check the wiring harness between the inside rear view mirror connector D-04 (terminal 3) and ground. 

   Q: Is the wiring harness between the inside rear view mirror connector D-04 (terminal 3) and ground in good condition? 

   YES  : Go to Step 8.

   NO:  Repair the wiring harness. Then go to Step 8.

   Fig 8: Checking Wiring Harness Between Inside Rear View Mirror Connector D-04

   Courtesy of DAIMLERCHRYSLER CORPORATION
8. STEP 8. Check the symptoms 

   Q: Does the indicator illuminate? 

   YES  : There is no action to be taken.

   NO:  Replace the inside rear view mirror. Refer to INSIDE REAR VIEW MIRROR  .