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Inspection Procedure 3: The SRS Warning Light does not Illuminate.
 
 

 
 
CIRCUIT OPERATION
  • The SRS warning light illuminates when the ignition switch is turned to the "ON" position and goes out after approximately seven seconds if there is not a malfunction in the SRS system.
  • SRS-ECU sends the SRS warning light signal to the combination meter via the CAN communication.
  • As a cause, the failure of CAN bus line, combination meter, or SRS-ECU is suspected.
 
 
TROUBLESHOOTING HINTS
  • Damaged wiring harness and connectors
  • Combination meter malfunction
  • Malfunction of SRS-ECU
 
 
DIAGNOSIS
STEP 1. Using scan tool MB991958, diagnose the CAN bus line.
cautionTo prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
Use scan tool MB991958 to diagnose the CAN bus lines.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
Is the check result satisfactory?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C, Diagnosis ).
 
STEP 2. Using scan tool MB991958, check actuator test
Check the SRS-ECU actuator tests.
Item No. 01: SRS warning light
Does the SRS warning light turn on and off normally?
Go to Step 3.
Replace SRS-ECU. (Refer to .)
 
STEP 3. Using scan tool MB991958, check actuator test
Check the combination meter actuator tests.
Item No. 07: Indicator 1
Does the SRS warning light turn on and off normally?
Go to Step 4.
Replace the combination meter. (Refer to GROUP 54A, Combination Meter .)
 
STEP 4. Wiring harness inspection between C-417 ETACS-ECU connector terminal No. 5 and C-203 combination meter connector terminal No. 2
notePrior to the wiring harness inspection, check the ETACS-ECU connectors C-417 and combination meter connector C-203 and repair if necessary.
  • The SRS warning light inspection for open and short circuit
Is the check result normal?
If other systems are normally operated, replace the combination meter. (Refer to GROUP 54A, Combination Meter .)
Repair the wiring harness.