Inspection Procedure O-16

Liftgate Lock Key Cylinder Switch Input Circuit:

Connector: F-10:

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

TECHNICAL DESCRIPTION (COMMENT)
The liftgate lock key cylinder switch 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 liftgate lock key cylinder switch
- Malfunction of the ETACS-ECU
- Damaged harness wires or connectors

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







STEP 1. Check the liftgate lock key cylinder switch.
If the liftgate lock key cylinder switch is damaged, replace it.
The input signal from the liftgate lock key cylinder switch should be able to be checked and the theft-alarm system should be armed.
If the liftgate lock key cylinder switch is in good condition, go to Step 2.




STEP 2. Check the liftgate lock key cylinder switch ground circuit at liftgate lock key cylinder switch connector F-10.
1. Disconnect liftgate lock key cylinder switch connector F-10 and measure at the harness side.
2. Resistance between terminal 2 and ground.
- Should be less than 2 Ohms.
If open circuit, go to Step 3.
If less than 2 Ohms, go to Step 5.




STEP 3. Check liftgate lock key cylinder switch connector F-10 for damage.
If liftgate lock key cylinder switch connector F-10 is damaged, repair or replace it. Refer to Harness Connector Inspection.
The input signal from the liftgate lock key cylinder switch should be able to be checked and the theft-alarm system should be armed.
If the connector is in good condition, go to Step 4.




STEP 4. Check the harness wire between liftgate lock key cylinder switch connector F-10 and ground.
If the harness wire between liftgate lock key cylinder switch connector F-10 and ground is damaged, repair it.
The input signal from the liftgate lock key cylinder switch should be able to be checked and the theft-alarm system should be armed.







STEP 5. Check the liftgate lock key cylinder switch connector F-10 and ETACS-ECU connector C-112 for damage.
If the liftgate lock key cylinder switch connector F-10 and ETACS-ECU connector C-112 are damaged, repair or replace them. Refer to Harness Connector Inspection. The input signal from the liftgate lock key cylinder switch should be able to be checked and the theft-alarm system should be armed.
If the connectors are in good condition, go to Step 6.










STEP 6. Check the harness wires between liftgate 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.

If the harness wires between liftgate lock key cylinder switch connector F-10 and ETACS-ECU connector C-112 are damaged, repair them.
The input signal from the liftgate lock key cylinder switch should be able to be checked and the theft-alarm system should be armed.

If the harness wires are in good condition, replace the ETACS-ECU.
The input signal from the liftgate lock key cylinder switch should be able to be checked and the theft-alarm system should be armed.