INSPECTION PROCEDURE 1: When the ignition switch is turned "ON" (Engine stopped or after start-up), the Active skid control system operation indicator light/Active traction control system operation indicator light does not illuminate.: Diagnosis

Required Special Tool: 

• MB991223: Harness Set

1. STEP 1. Check the Active skid control system operation indicator light/Active traction control system operation indicator light circuit at M-ASTC-ECU connector E-121. 
   1. Disconnect M-ASTC-ECU connector E-121 and measure at the harness side.
   2. Turn the ignition switch to the "ON" position.
      Fig 1: Identifying Connector E-121

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   3. Measure the voltage between terminal 74 and ground. It should be approximately 12 volts (battery positive voltage).
      Fig 2: Measuring Voltage Between Terminal 74 And Ground

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   Q: Is the voltage approximately 12 volts (battery positive voltage)? 

   1. YES:  Replace the M-ASTC-ECU and then go to  Step 4.
   2. NO:  Go to Step 2.
2. STEP 2. Check the harness wires between ignition switch (IG1) connector D-204 terminal 2 and combination meter connector D-03 terminal 62. 
   NOTE: After inspecting combination meter connector D-03, ignition switch (IG1) connector D-204, junction block connector D-208 and D-210, inspect the wire. If combination meter connector D-03, ignition switch (IG1) connector D-204, junction block connector D-208 and D-210 are damaged, repair or replace them. Refer to HARNESS CONNECTOR INSPECTION . Then go to  Step 4.
   Fig 3: Identifying Connector D-03

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   Fig 4: Identifying Connector D-204

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   Fig 5: Identifying Connectors D-208 And D-210

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   Q: Is the harness wire between ignition switch (IG1) connector D-204 terminal 2 and combination meter connector D-03 terminal 62 damaged? 

   1. YES:  Repair the wiring harness wires between ignition switch (IG1) connector D-204 terminal 2 and combination meter connector D-03 terminal 62. Then go to  Step 4.
   2. NO:  Go to Step 3.
3. STEP 3. Check the harness wires between combination meter connector D-03 terminal 62 and M-ASTC-ECU connector E-121 terminal 74. 
   NOTE: After inspecting combination meter connector combination meter connector D-03, intermediate connector E-122 and M-ASTC-ECU connector E-121, inspect the wire. If combination meter connector D-03, intermediate connector E-122 and M-ASTC-ECU connector E-121 are damaged, repair or replace them. Refer to HARNESS CONNECTOR INSPECTION . Then go to Step 4.
   Fig 6: Identifying Connector D-03

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   Fig 7: Identifying Connector E-121

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   Fig 8: Identifying Connectors E-122

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   Q: Is the harness wire between combination meter connector D-03 terminal 62 and M-ASTC-ECU connector E-121 terminal 74 damaged? 

   1. YES:  Repair it and then go to Step 4.
   2. NO:  Replace the combination meter (printed circuit board), and then go to Step 4.
4. STEP 4. Retest the system. 

   Q: When the ignition switch is turned "ON" (engine stopped or after start-up), does the Active skid control system operation indicator light/Active traction control system operation indicator light illuminate? 

   1. YES:  The procedure is complete.
   2. NO:  Return to  Step 1.