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DTC B1707: Flasher open
 
 
cautionWhenever the ECU is replaced, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.
 
 
TECHNICAL DESCRIPTION (COMMENT)
When the turn-signal light bulb is blown, or connector(s) or wiring harness between the ETACS-ECU, the turn-signal light which does not illuminate and ground is defective, the ETACS-ECU stores DTC B1707.
 
 
TROUBLESHOOTING HINTS
  • The turn-signal light bulb may be defective
  • The headlight assembly may be defective
  • The rear combination light assembly may be defective
  • The ETACS-ECU 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. Confirm which turn-signal light is defective.
Which turn-signal light fails to illuminate correctly?
Front turn-signal light : Go to Step 2.
Side turn-signal light : Go to Step 7.
Rear turn-signal light : Go to Step 12.
 
STEP 2. Check the bulb(s) of the front turn-signal lights.
Check the bulb(s) of the defective light.
Is the check result normal?
Go to Step 3.
Replace the bulb(s) of the defective light. Go to Step 17.
 
STEP 3. Resistance measurement at the front turn-signal light (LH) connector or front turn-signal light (RH) connector.
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Resistance measurement between the defective light connector terminal and ground.
  • Measure the resistance between the front turn-signal light (LH) connector (ground terminal) and the ground.
  • Measure the resistance between the front turn-signal light (RH) connector (ground terminal) and the ground.
OK: The resistance should be 2 ohms or less
Is the check result normal?
Go to Step 5.
Go to Step 4.
 
STEP 4. Check of open circuit in ground line between front turn-signal light (LH) connector or front turn-signal light (RH) connector and ground.
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 ). Go to Step 17.
Repair the connector(s) or wiring harness. Go to Step 17.
 
STEP 5. Check of open circuit in TURN LH or TURN RH line between front turn-signal light (LH) connector or front turn-signal light (RH) connector and ETACS-ECU connector.
Is the check result normal?
Go to Step 6.
Repair the connector(s) or wiring harness. Go to Step 17.
 
STEP 6. Retest the system.
Check that the front turn-signal lights 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 ). Go to Step 17.
Replace the front turn-signal light. Go to Step 17.
 
STEP 7. Check the bulb(s) of side turn-signal lights.
Check the bulb(s) of the defective light.
Is the check result normal?
Go to Step 8.
Replace the bulb(s) of the defective light. Go to Step 17.
 
STEP 8. Resistance measurement at the side turn-signal light (LH) connector or side turn-signal light (RH) connector.
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Resistance measurement between the defective light connector terminal and ground.
  • Measure the resistance between the side turn-signal light (LH) connector (ground terminal) and the ground.
  • Measure the resistance between the side turn-signal light (RH) connector (ground terminal) and the ground.
OK: The resistance should be 2 ohms or less
Is the check result normal?
Go to Step 10.
Go to Step 9.
 
STEP 9. Check of open circuit in ground line between side turn-signal light (LH) connector or side turn-signal light (RH) connector and ground.
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 ).
Repair the connector(s) or wiring harness. Go to Step 17.
 
STEP 10. Check of open circuit in TURN LH or TURN RH line between side turn-signal light (LH) connector or side turn-signal light (RH) connector and ETACS-ECU connector.
Is the check result normal?
Go to Step 11.
Repair the connector(s) or wiring harness. Go to Step 17.
 
STEP 11. Retest the system.
Check that the side turn-signal lights 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 ). Go to Step 17.
Replace the side turn-signal light. Go to Step 17.
 
STEP 12. Check the bulb(s) of rear turn-signal lights.
Check the bulb(s) of the defective light.
Is the check result normal?
Go to Step 13.
Replace the bulb(s) of the defective light. Go to Step 17.
 
STEP 13. Resistance measurement at the rear combination light (turn: LH) or rear combination light (turn: RH) connector.
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Resistance measurement between the defective light connector terminal and ground.
  • Measure the resistance between the side rear combination light (turn: LH) connector (ground terminal) and the ground.
  • Measure the resistance between the side rear combination light (turn: RH) connector (ground terminal) and the ground.
OK: The resistance should be 2 ohms or less
Is the check result normal?
Go to Step 15.
Go to Step 14.
 
STEP 14. Check of open circuit in ground line between rear combination light (turn: LH) connector or rear combination light (turn: RH) connector and ground.
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 ). Go to Step 17.
Repair the connector(s) or wiring harness. Go to Step 17.
 
STEP 15. Check of open circuit in TURN LH or TURN RH line between rear combination light (turn: LH) connector or rear combination light (turn: RH) connector and ETACS-ECU connector.
Is the check result normal?
Go to Step 16.
Repair the connector(s) or wiring harness. Go to Step 17.
 
STEP 16. Retest the system.
Check that the rear turn-signal lights 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 ). Go to Step 17.
Replace the rear combination light. Go to Step 17.
 
STEP 17. Using scan tool (M.U.T.-III), Check whether the diagnostic trouble code is stored again.
(1)
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
Connect scan tool (M.U.T.-III). Refer to "How to connect Scan Tool (M.U.T.-III) ."
(2) Turn the ignition switch to the "ON" position.
(3) Erase the DTC.
(4) Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(5) Check whether the ETACS-ECU DTC is stored.
Is the DTC stored?
Replace the ETACS-ECU.
The procedure is complete.