Code No.U1610 Auto-lamp sensor (low input) <vehicles without lighting control sensor>
Code No.U1611 Auto-lamp sensor (high input) <vehicles without lighting control sensor>












JUDGMENT CRITERIA



PROBABLE CAUSES



  • Malfunction of the photo sensor
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code
Check if the diagnosis code No. B222C (coding incomplete) is set to the ETACS-ECU.

Q. Is the diagnosis code set?
Troubleshoot the ETACS. Refer to .
Go to Step 2.

STEP 2. M.U.T.-III data list
Based on the ETACS-ECU service data, inspect the photo sensor.

  • Vary the illumination intensity of the photo sensor.
Item No.
 Item name
 Normal condition
Item 251
 Auto light sensor
 The voltage changes within a range of 0 to 5 V.
OK: Normal condition is displayed.

Q. Is the check result normal?
Go to Step 5.
Go to Step 3.

STEP 3. Connector check: C-05 photo sensor connector, C-301 ETACS-ECU connector

Q. Is the check result normal?
Go to Step 4.
Repair the defective connector.

STEP 4. Wiring harness check between the C-05 photo sensor connector terminal Nos. 1, 2, 3 and the C-301 ETACS-ECU connector terminal Nos. 3, 18, 20.

Q. Is the check result normal?
Replace the photo sensor, and then go to Step 5.
Repair the wiring harness.

STEP 5. Check whether the diagnosis code is reset.
Check again if the diagnosis code is set to the ETACS-ECU.
(1)Erase the diagnosis code.
(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3)Check if diagnosis code is set.

Q. Is the diagnosis code set?
Replace the ETACS-ECU.
The procedure is complete.