[ Model - ECLIPSE CROSS / Year - 2018 ]
2018 / ECLIPSE CROSS / EC - Workshop Manual
54 -CHASSIS ELECTRICAL > 54A-CHASSIS ELECTRICAL > REAR COMBINATION LAMP > DIAGNOSIS CODE PROCEDURES > CODE NO.B16A8 TAIL LAMP (LH) CIRCUIT SHORT
Code No.B16A8 Tail lamp(LH) circuit short <Short circuit in the position lamp (LH) circuit, tail lamp (LH) circuit or the licence plate lamp circuit>
 
 
caution
  • Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.
 
 
DIAGNOSTIC FUNCTION
When a short circuit is detected in the following lamp circuit, the ETACS-ECU sets diagnosis code No. B16A8.
  • Tail lamp
  • Licence lamp
  • Position lamp
 
 
JUDGEMENT CRITERIA
The problem detection of tail lamp is made based on the digital feed back signal (input signal to ETACS-ECU) which operates the tail lamp. When the ignition switch is "ON", the ETACS-ECU determines the tail lamp circuit state from the load placed on the line. After 100 ms has elapsed since the start of the check, the ETACS-ECU performs a sampling with each 10 ms. If an abnormality is detected, it increases the counter by 2, and when no abnormality is detected, it decreases the counter by 1. Once the counter reaches "10," the ETACS-ECU sets diagnosis code No. B16A8 if no load is detected.
 
 
PROBABLE CAUSES
  • Malfunction of headlamp assembly (position: LH)
  • Malfunction of rear combination lamp unit (tail: LH)
  • Malfunction of tail lamp unit (LH)
  • Malfunction of licence plate lamp bulbs
  • Damaged harness wires and connectors
  • Malfunction of the ETACS-ECU
 
 
DIAGNOSIS PROCEDURE
STEP 1. Resistance measurement at the rear combination lamp (tail: LH) connector (power supply terminal).
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Measure the resistance between the rear combination lamp (tail: LH) connector (power supply terminal) and body earth.
OK: Continuity exists (2 Ω or less)
Is the check result normal?
Go to Step 3.
Go to Step 2.
 
STEP 2. Check of short to earth and power supply in (TAL2) lines between the rear combination lamp (tail: LH) connector and ETACS-ECU connector.
Is the check result normal?
Go to Step 3.
Repair the connector(s) or wiring harness.
 
STEP 3. Check whether the diagnosis code is set again.
(1) Erase the diagnosis code.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3) Check if diagnosis code is set.
Is the diagnosis code set?
Go to Step 4.
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
 
STEP 4. Check whether the diagnosis code is set again.
(1) Erase the diagnosis code.
(2) Disconnect the rear combination lamp (tail: LH) connector.
(3) Lighting operation of a tail lamp is performed.
(4) Check if diagnosis code is set.
Is the diagnosis code set?
Go to Step 5.
Replace the rear combination lamp unit (LH).
 
STEP 5. Resistance measurement at the tail lamp (LH) connector (power supply terminal).
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Measure the resistance between the tail lamp (LH) connector (power supply terminal) and the body earth.
OK: Continuity exists (2 Ω or less)
Is the check result normal?
Go to Step 7.
Go to Step 6.
 
STEP 6. Check of short to earth and power supply in (TAL2) lines between the tail lamp (LH) connector and ETACS-ECU connector.
Is the check result normal?
Go to Step 7.
Repair the connector(s) or wiring harness.
 
STEP 7. Check whether the diagnosis code is set again.
(1) Erase the diagnosis code.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3) Check if diagnosis code is set.
Is the diagnosis code set?
Go to Step 8.
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
 
STEP 8. Check whether the diagnosis code is set again.
(1) Erase the diagnosis code.
(2) Disconnect the tail lamp (LH) connector.
(3) Lighting operation of a tail lamp is performed.
(4) Check if diagnosis code is set.
Is the diagnosis code set?
Go to Step 9.
Replace the tail lamp unit (LH).
 
STEP 9. Check the licence plate lamp bulbs.
Check the continuity at the licence lamp bulb (RH) or (LH) to confirm whether it is normal.
Is the check result normal?
Go to Step 10.
Replace the rear combination lamp bulb (RH) or (LH).
 
STEP 10. Resistance measurement at the licence plate lamp (RH), or (LH) connector (power supply terminal).
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Measure the resistance between the licence plate lamp (RH) or (LH) connector (power supply terminal) and the body earth.
OK: Continuity exists (2 Ω or less)
Is the check result normal?
Go to Step 12.
Go to Step 11.
 
STEP 11. Check of short to earth and power supply in (TAL2) lines between the licence plate lamp (RH) or (LH) connector and ETACS-ECU connector.
Is the check result normal?
Go to Step 12.
Repair the connector(s) or wiring harness.
 
STEP 12. Check whether the diagnosis code is set again.
(1) Erase the diagnosis code.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3) Check if diagnosis code is set.
Is the diagnosis code set?
Go to Step 13.
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
 
STEP 13. Resistance measurement at the headlamp assembly (position: LH) connector (power supply terminal).
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Measure the resistance between the headlamp assembly (position: LH) connector (power supply terminal) and the body earth.
OK: Continuity exists (2 Ω or less)
Is the check result normal?
Go to Step 15.
Go to Step 14.
 
STEP 14. Check of short to earth and power supply in (TAR1) lines between the headlamp assembly (position: LH) connector and ETACS-ECU connector.
Is the check result normal?
Go to Step 15.
Repair the connector(s) or wiring harness.
 
STEP 15. Check whether the diagnosis code is set again.
(1) Erase the diagnosis code.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3) Check if diagnosis code is set.
Is the diagnosis code set?
Go to Step 16.
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
 
STEP 16. Check whether the diagnosis code is set again.
(1) Erase the diagnosis code.
(2) Disconnect the headlamp (position: LH) connector.
(3) Lighting operation of a position lamp is performed.
(4) Check if diagnosis code is set.
Is the diagnosis code set?
Replace the ETACS-ECU.
Replace the headlamp assembly (LH).