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Inspection Procedure N-12

Trunk Lid Latch Switch Input Circuit:




Connectors: F-16, F-21:






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

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

TROUBLESHOOTING HINTS
- Malfunction of the trunk lid latch
- 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 trunk lid latch switch.
If the trunk lid latch switch is damaged, replace it.

The input signal from the trunk lid latch switch should be able to be checked and the theft-alarm system should be armed normally.

If the trunk lid latch switch is in good condition, go to Step 2.




STEP 2. Check the trunk lid latch switch ground circuit at trunk lid latch switch connector F-21.
1. Disconnect trunk latch switch connector F-21 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 trunk lid latch switch connector F-21 for damage.
If the trunk lid latch switch connector F-21 is damaged, repair or replace it. Refer to Harness Connector Inspection.

The input signal from the trunk lid latch switch should be able to be checked and the theft-alarm system should be armed normally.

If the connector is in good condition, go to Step 4.




STEP 4. Check the harness wires between trunk lid latch switch connector F-21 and ground.

NOTE: For 1999 models, after checking intermediate connector F-16, check the wires. If intermediate connector F-16 is damaged, repair or replace it. Refer to Harness Connector Inspection.

If the harness wires between trunk lid latch switch connector F-21 and ground are damaged, repair them.

The input signal from the trunk lid latch switch should be able to be checked and the theft-alarm system should be armed normally.







STEP 5. Check the trunk lid latch switch connector F-21 and ETACS-ECU connector C-81 for damage.
If the trunk lid latch switch connector F-21 and ETACS-ECU connector C-81 are damaged, repair or replace them. Refer to Harness Connector Inspection.

The input signal from the trunk lid latch switch should be able to be checked and the theft-alarm system should be armed normally.

If the connectors are in good condition, go to Step 6.










STEP 6. Check the harness wires between trunk lid latch switch connector F-21 and ETACS-ECU connector C-81.

NOTE: After checking intermediate connectors C-67 and F-16 <1999 models only>, check the wires. If intermediate connectors C-67 and F-16<1999 models only> are damaged, repair or replace them. Refer to Harness Connector Inspection.

If the harness wires between trunk lid latch switch connector F-21 and ETACS-ECU connector C-81 are damaged, repair them.

The input signal from the trunk lid latch switch should be able to be checked and the theft-alarm system should be armed normally.

If the harness wires are in good condition, replace the ETACS-ECU.

The input signal from the trunk lid latch switch should be able to be checked and the theft-alarm system should be armed normally.
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