Inspection Procedure O-13

The trunk lid lock key cylinder switch signal is not sent to the ETACS-ECU.

Trunk Lid Lock Key Cylinder Switch Input Circuit:

CIRCUIT OPERATION
The ETACS-ECU uses the input signal from the trunk lid lock key cylinder switch to arm the theft-alarm system.

TECHNICAL DESCRIPTION (COMMENT)
The trunk lid lock key cylinder switch input signal is used to arm the theft-alarm system. If the input signal is an error, the theft-alarm system will not be armed normally.

TROUBLESHOOTING HINTS
- Malfunction of the tank lid lock key cylinder switch
- Malfunction of the ETACS-ECU
- Damaged harness wires or connectors

DIAGNOSIS

Required Special Tools:
- MB991223: Harness Set
- MB991502: Scan Tool (MUT-II)
- MB991529: Diagnostic Trouble Code Check Harness







STEP 1. Check the trunk lid lock key cylinder switch.

Q: Is the trunk lid lock key cylinder switch in good condition?

YES: Go to Step 2.
NO: Replace it. The input signal from the trunk lid lock key cylinder switch should be able to be checked and the theft-alarm system should be armed normally.

STEP 2. Check the trunk lid lock key cylinder switch ground circuit at trunk lid lock key cylinder switch connector F-06.
1. Disconnect trunk lid lock key cylinder switch connector F-06 and measure at the harness side.




2. Measure the resistance between terminal 2 and ground.

Q: Is the resistance less than 2 ohm?

YES: Go to Step 5.
NO: Go to Step 3.




STEP 3. Check trunk lid lock key cylinder switch connector P-06 for damage.

Q: Is trunk lid lock key cylinder switch connector F-06 in good condition?

YES: Go to Step 4.
NO: Repair or replace it. Refer to Harness Connector Inspection. The input signal from the trunk lid lock key cylinder switch should be able to be checked and the theft-alarm system should be armed normally.




STEP 4. Check the harness wire between trunk lid lock key cylinder switch connector F-06 and ground.

Q: Is the harness wire between trunk lid lock key cylinder switch connector F-06 and ground in good condition?

YES: There is no action to be taken.
NO: Repair it. The input signal from the trunk lid lock key cylinder switch should be able to be checked and the theft-alarm system should be armed normally.







STEP 5. Check trunk lid lock key cylinder switch connector F-06 and ETACS-ECU connector C-312 for damage.

Q: Are trunk lid lock key cylinder switch connector F-06 and ETACS-ECU connector C-312 in good condition?

YES: Go to Step 6.
NO: Repair or replace them. Refer to Harness Connector Inspection. The input signal from the trunk lid lock key cylinder switch should be able to be checked and the theft-alarm system should be armed normally.







STEP 6. Check the harness wires between trunk lid lock key cylinder switch connector F-06 and ETACS-ECU connector C-312.






NOTE: After checking intermediate connector C-210, check the wires. If intermediate connector C-210 is damaged, repair or replace it. Refer to Harness Connector Inspection.

Q: Are the harness wires between trunk lid lock key cylinder switch connector F-06 and ETACS-ECU connector C-312 in good condition?

YES: Replace the ETACS-ECU. The input signal from the trunk lid lock key cylinder switch should be able to be checked and the theft-alarm system should be armed normally.
NO: Repair them. The input signal from the trunk lid lock key cylinder switch should be able to be checked and the theft-alarm system should be armed normally.