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Inspection Procedure 1: The front dome light does not illuminate normally.
 
 
 
 
OPERATION
The ETACS-ECU illuminates and extinguishes the front dome light in accordance with the input signals below.
  • OSS-ECU (IG1) signal
  • Key reminder switch
  • Door switches
  • Front door lock actuator (driver’s side)
 
 
TECHNICAL DESCRIPTION (COMMENT)
If this does not work normally, the above switch input circuit(s), front dome light, or ETACS-ECU may have a problem.
 
 
TROUBLESHOOTING HINTS
  • The door switch may be defective
  • The front door lock actuator (driver’s side) may be defective
  • The front dome light 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
STEP 1. Rear dome light operation check
Check that the rear dome light illuminates and extinguishes normally.
Is the check result normal?
Go to Step 4.
Go to Step 2.
 
STEP 2. Using scan tool (M.U.T.-IIISE), read the DTC.
(1)
cautionTo prevent damage to scan tool (M.U.T.-IIISE), always turn off the power supply mode of the electric motor switch before connecting or disconnecting scan tool (M.U.T.-IIISE).
Connect scan tool (M.U.T.-IIISE). Refer to "How to connect Scan Tool (M.U.T.-IIISE) ."
(2) Press the electric motor switch to turn on the power supply mode.
(3) Check whether the ETACS-ECU related DTC is set.
(4) Press the electric motor switch to turn off the power supply mode.
Is the DTC set?
Troubleshoot the ETACS-ECU. Refer to .
Go to Step 3.
 
STEP 3. Using scan tool (M.U.T.-IIISE), check data list.
Use the ETACS-ECU service data to check the signals related to the operation of front dome light.
  • Press the electric motor switch to turn off the power supply mode.
  • Open each door.
 
Item No.Item nameNormal condition
228Dr door unlockON
254IG voltage1 V or less
256Dr door ajar switchOpen
257As door ajar switchOpen
258RR door ajar switchOpen
259RL door ajar switchOpen
OK: Normal conditions are displayed for all the items.
Is the check result normal?
: Replace the ETACS-ECU.
: Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 3 "The front door lock actuator (driver’s side) signal is not received" .
: Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 2 "The OSS-ECU (IG1) signal is not received" .
: Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 4 "The front door switch (driver’s side) signal is not received" .
: Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 5 "The front door switch (passenger’s side) signal is not received" .
: Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 6 "The rear door switch (RH) signal is not received" .
: Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 7 "The rear door switch (LH) signal is not received" .
 
STEP 4. Front dome light bulb check
Check that the front dome light bulb is normal.
Is the check result normal?
Go to Step 5.
Replace the front dome light bulb.
 
STEP 5. Check of open circuit in LP+1 line between the front dome light connector and ETACS-ECU connector.
Is the check result normal?
Go to Step 6.
Repair the connector(s) or wiring harness.
 
STEP 6. Check of open circuit in RLP- line between the front dome light connector and ETACS-ECU connector.
Is the check result normal?
Go to Step 7.
Repair the connector(s) or wiring harness.
 
STEP 7. Check of open circuit in ground line between the front dome light connector and ground.
Is the check result normal?
Replace the front dome light, and then go to Step 8.
Repair the connector(s) or wiring harness.
 
STEP 8. Retest the system
Check that the front dome light illuminates/extinguishes 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 ETACS-ECU.