Code No.B1707:
Flasher open
COMMENTS ON TROUBLE SYMPTOM
When the turn-signal lamp bulb is blown, or connector(s) or wiring harness between the
ETACS-ECU, the turn-signal lamp which does not illuminate and body earth is defective, the ETACS-ECU
set diagnosis code No.B1707.
PROBABLE CAUSES
- Malfunction of the turn-signal lamp bulb
- Malfunction of the headlamp assembly
- Malfunction of the rear combination lamp assembly
- Malfunction of the ETACS-ECU
- Damaged harness wires and connectors
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STEP 1. Confirm which turn-signal lamp is defective.
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Q.
Which turn-signal lamp fails to illuminate correctly?
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Front turn-signal lamp : Go to Step 2.
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Side turn-signal lamp : Go to Step 7.
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Rear turn-signal lamp : Go to Step 12.
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STEP 2. Check the bulb(s) of the front turn-signal lamps.
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Check the bulb(s) of the defective lamp.
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Q.
Is the check result normal?
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 Go to Step 3.
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 Replace the bulb(s) of the defective lamp. Go to Step 17.
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STEP 3. Resistance measurement at the front turn-signal lamp (LH)
connector or front turn-signal lamp (RH) connector.
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Resistance measurement between the defective lamp connector terminal and body earth.
- Measure the resistance between the front turn-signal lamp (LH) connector
(earth terminal) and the body earth.
- Measure the resistance between the front turn-signal lamp (RH) connector (earth
terminal) and the body earth.
OK: Continuity exists (2 Ω
or less)
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Q.
Is the check result normal?
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Go to Step 5.
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Go to Step 4.
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STEP 4. Check of open circuit in body earth line between front turn-signal
lamp (LH) connector or front turn-signal lamp (RH) connector and body earth.
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Q.
Is the check result normal?
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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.
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Repair the connector(s) or wiring harness. Go to Step 17.
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STEP 5. Check of open circuit in TURN LH or TURN RH line between front
turn-signal lamp (LH) connector or front turn-signal lamp (RH) connector and ETACS-ECU connector.
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Q.
Is the check result normal?
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Go to Step 6.
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Repair the connector(s) or wiring harness. Go to Step 17.
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STEP 6. Retest the system.
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Check that the front turn-signal lamps illuminate normally.
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Q.
Is the check result normal?
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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.
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Replace the front turn-signal lamp. Go to Step 17.
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STEP 7. Check the bulb(s) of side turn-signal lamps.
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Check the bulb(s) of the defective lamp.
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Q.
Is the check result normal?
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Go to Step 8.
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Replace the bulb(s) of the defective lamp. Go to Step 17.
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STEP 8. Resistance measurement at the side turn-signal lamp (LH) connector
or side turn-signal lamp (RH) connector.
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Resistance measurement between the defective lamp connector terminal and body earth.
- Measure the resistance between the side turn-signal lamp (LH) connector (earth
terminal) and the body earth.
- Measure the resistance between the side turn-signal lamp (RH) connector (earth terminal)
and the body earth.
OK: Continuity exists (2 Ω
or less)
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Q.
Is the check result normal?
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Go to Step 10.
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Go to Step 9.
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STEP 9. Check of open circuit in body earth line between side turn-signal
lamp (LH) connector or side turn-signal lamp (RH) connector and body earth.
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Q.
Is the check result normal?
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The trouble can be an intermittent malfunction (Refer to GROUP 00 -
How
to use Troubleshooting/inspection Service Points -
How to Cope with Intermittent
Malfunction ).
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Repair the connector(s) or wiring harness. Go to Step 17.
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STEP 10. Check of open circuit in TURN LH or TURN RH line between
side turn-signal lamp (LH) connector or side turn-signal lamp (RH) connector and ETACS-ECU connector.
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Q.
Is the check result normal?
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Go to Step 11.
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Repair the connector(s) or wiring harness. Go to Step 17.
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STEP 11. Retest the system.
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Check that the side turn-signal lamps illuminate normally.
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Q.
Is the check result normal?
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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.
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Replace the side turn-signal lamp. Go to Step 17.
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STEP 12. Check the bulb(s) of rear turn-signal lamps.
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Check the bulb(s) of the defective lamp.
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Q.
Is the check result normal?
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Go to Step 13.
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Replace the bulb(s) of the defective lamp. Go to Step 17.
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STEP 13. Resistance measurement at the rear combination lamp (turn:
LH) or rear combination lamp (turn: RH) connector.
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Resistance measurement between the defective lamp connector terminal and body earth.
- Measure the resistance between the side rear combination lamp (turn: LH)
connector (earth terminal) and the body earth.
- Measure the resistance between the side rear combination lamp (turn: RH) connector
(earth terminal) and the body earth.
OK: Continuity exists (2 Ω
or less)
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Q.
Is the check result normal?
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Go to Step 15.
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Go to Step 14.
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STEP 14. Check of open circuit in body earth line between rear combination
lamp (turn: LH) connector or rear combination lamp (turn: RH) connector and body earth.
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Q.
Is the check result normal?
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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.
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Repair the connector(s) or wiring harness. Go to Step 17.
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STEP 15. Check of open circuit in TURN LH or TURN RH line between
rear combination lamp (turn: LH) connector or rear combination lamp (turn: RH) connector and
ETACS-ECU connector.
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Q.
Is the check result normal?
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Go to Step 16.
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Repair the connector(s) or wiring harness. Go to Step 17.
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STEP 16. Retest the system.
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Check that the rear turn-signal lamps illuminate normally.
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Q.
Is the check result normal?
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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.
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Replace the rear combination lamp. Go to Step 17.
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STEP 17. Check whether the diagnosis code is reset.
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Check if diagnosis code No.B1707 is set to the ETACS-ECU.
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Q.
Is the diagnosis code set?
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Replace the ETACS-ECU.
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The procedure is complete.
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