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Inspection Procedure 2: One of taillights does not illuminate.
 
 
 
 
TECHNICAL DESCRIPTION (COMMENT)
If one of the taillights does not Illuminate, the wiring harness, connector(s), or rear combination light unit may have a problem, or the fuse may be burned out.
 
 
TROUBLESHOOTING HINTS
  • The rear combination light assembly may be faulty.
  • The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.
 
 
DIAGNOSIS
Required Special Tools:
  • MB992006: Extra fine probe
  • MB991223: Harness set
STEP 1. Resistance measurement at the rear combination light (taillight/rear side marker light: LH) connector or rear combination light (taillight/rear side marker light: RH) connector.
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Check the resistance between the light connector and ground.
  • Measure the resistance between the rear combination light (taillight/rear side marker light: LH) connector (ground terminal) and the ground.
  • Measure the resistance between the rear combination light (taillight/rear side marker light: RH) connector (ground terminal) and the ground.
OK: The resistance should be 2 ohm or less.
Is the check result normal?
Go to Step 3.
Go to Step 2.
 
STEP 2. Check of open circuit in ground line between the rear combination light (taillight/rear side marker light: LH) connector or rear combination light (taillight/rear side marker light: RH) connector and ground.
Is the check result normal?
Go to Step 3.
Repair the connector(s) or wiring harness.
 
STEP 3. Check of open circuit in TAIL LP lines between the rear combination light (taillight/rear side marker light: LH) connector or rear combination light (taillight/rear side marker light: RH) connector and ETACS-ECU connector.
Is the check result normal?
Go to Step 4.
Repair the connector(s) or wiring harness.
 
STEP 4. Retest the system.
Check that the taillights illuminate normally.
Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
Replace the rear combination light assembly.