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Inspection Procedure 3: The backup light do not illuminate normally.
 
 
 
 
TECHNICAL DESCRIPTION (COMMENT)
If both of the back-up light do not illuminate normally, the input signal circuit(s) or the transmission range switch <CVT>, backup light switch <M/T>, may be defective.
 
 
TROUBLESHOOTING HINTS
  • The transmission range switch <CVT> or backup light switch <M/T> may be defective.
  • The bulbs may be defective.
  • The rear combination light assembly may be defective.
  • 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. Check the bulb of the backup light.
Check the bulb of the defective light.
Is the check result normal?
Go to Step 2.
Replace the bulb of the defective light.
 
STEP 2. Check the transmission range switch <CVT> or backup light switch <M/T>.
Check the continuity of the transmission range switch <CVT> or the backup light switch <M/T>. (GROUP 23A - On-vehicle Service, Transmission Range Switch Continuity Check <CVT>, GROUP 22B - Transmission, Transmission Inspection <M/T>)
Is the check result normal?
Go to Step 3.
Replace the transmission range switch <CVT> or backup light switch <M/T>.
 
STEP 3. Voltage measurement at the transmission range switch connector <CVT> or backup light switch connector <M/T>.
(1) Remove the transmission range switch connector <CVT> or backup light switch connector <M/T>, and measure at the junction block side.
(2) Move the ignition switch to the "ON" position.
(3) Measure the voltage between the transmission range switch connector <CVT> or backup light switch connector <M/T> (power supply terminals) and ground.
OK: The voltage should measure approximately 12 volts (battery positive voltage).
Is the check result normal?
Go to Step 5.
Go to Step 4.
 
STEP 4. Check of open circuit in power supply line between the transmission range switch connector <CVT> or backup light switch connector <M/T> and the ignition switch (IG1) <vehicles without KOS> or IG1relay <vehicles with KOS>.
Is the check result normal?
Go to Step 5.
Repair the connector(s) or wiring harness.
 
STEP 5. Resistance measurement at the rear combination light (backup: LH) or rear combination light (backup: 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 (backup: LH) connector (ground terminal) and the ground.
  • Measure the resistance between the rear combination light (backup: RH) connector (ground terminal) and the ground.
OK: The resistance should be 2 ohms or less.
Is the check result normal?
Go to Step 7.
Go to Step 6.
 
STEP 6. Check of open circuit in ground line between rear combination light (backup: LH) or rear combination light (backup: RH) connector and ground.
Is the check result normal?
Go to Step 7.
Repair the connector(s) or wiring harness.
 
STEP 7. Check of open circuit in output line between the rear combination light (backup: LH) or rear combination light (backup: RH) connector and transmission range switch connector <CVT> or backup light switch connector <M/T>.
Is the check result normal?
Go to Step 8.
Repair the connector(s) or wiring harness.
 
STEP 8. Retest the system.
Check that the backup light 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.