DIAGNOSTIC ITEM 17: Diagnose When The Scan Tool Cannot Receive The Data Sent By SRS-ECU: Diagnosis

Required Special Tools: 

• MB991223: Harness Set
• MB992006: Extra Fine Probe

1. STEP 1. Check joint connector (CAN1) C-105 and SRS-ECU connector C-37 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 
   CAUTION:

   The strand end of the twisted wire should be within 10 cm (4 inches) from the connector. For details refer to SERVICE PRECAUTIONS  .

   Q: Are joint connector (CAN1) C-105 and SRS-ECU connector C-37 in good condition? 

   1. YES:  Go to Step 2.
   2. NO:  Repair the damaged parts.
2. STEP 2. Check the wiring harness between joint connector (CAN1) C-105 and SRS-ECU connector C-37 for open circuit. 
   CAUTION:

   Strictly observe the specified wiring harness repair procedure. For details refer to SERVICE PRECAUTIONS  .

   1. Disconnect joint connector (CAN1) C-105 and SRS-ECU connector C-37, and check the wiring harness.
   2. Check the wiring harness between joint connector (CAN1) C-105 (terminal 10) and SRS-ECU connector C-37 (terminal 15)

      OK: Continuity exists (2 Ω or less) 

      Fig 1: Measuring Resistance Between Joint Connector C-105 Terminal 10 & SRS-ECU Connector C-37 Terminal 15

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   3. Check the wiring harness between joint connector (CAN1) C-105 (terminal 21) and SRS-ECU connector C-37 (terminal 16)

      OK: Continuity exists (2 Ω or less) 

      Fig 2: Measuring Resistance Between Joint Connector C-105 Terminal 21 & SRS-ECU Connector C-37 Terminal 16

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

   Q: Is the wiring harness between joint connector (CAN1) C-105 and SRS-ECU connector C-37 in good condition? 

   1. YES:  Check the power supply circuit of the SRS-ECU. Refer to TROUBLE SYMPTOM CHART .
   2. NO:  Repair the wiring harness between joint connector (CAN1) C-105 and SRS-ECU connector C-37.