Inspection Procedure O-16

Liftgate Lock Key Cylinder Switch Signal Is Not Sent to the ETACS-ECU

Liftgate Lock Key Cylinder Switch Input Circuit:

Connectors:

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

DIAGNOSIS
Required Special Tools:
- MB991223: Harness Set







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-10.
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 ohms?

YES: Go to Step 5.

NO: Go to Step 3.







STEP 3. Check trunk lid lock key cylinder switch connector F-10 for damage.

Q: Is trunk lid lock key cylinder switch connector F-10 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-10 and ground.

Q: Is the harness wire between trunk lid lock key cylinder switch connector F-10 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-10 and ETACS-ECU connector C-112 for damage.

Q: Are trunk lid lock key cylinder switch connector F-10 and ETACS-ECU connector C-112 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-10 and ETACS-ECU connector C-112.

NOTE: After checking intermediate connector C-90, check the wires. If intermediate connector C-90 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-10 and ETACS-ECU connector C-112 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.