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Inspection Procedure N-12

N-12: the Trunk Lid Latch Switch Signal Is Not Sent to the ETACS-ECU.

Trunk Lid Latch Switch Input Circuit:






CIRCUIT OPERATION
The ETACS-ECU uses the input signal from the trunk lid latch switch to operate the following functions.

TECHNICAL DESCRIPTION (COMMENT)
The trunk lid latch switch input signal is used to operate the theft-alarm system. If the signal fails, these function will not work normally.

TROUBLESHOOTING HINTS
Malfunction of the trunk lid latch
- 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 latch switch.
Q: Is the trunk lid latch switch in good condition?

YES: Go to Step 2.

NO: Replace it. The input signal from the trunk lid latch switch should be able to be checked and the functions, which are described in the "Technical Description (comment)," should work normally.

STEP 2. Check the trunk lid latch switch ground circuit at trunk lid latch switch connector F-21.
1. Disconnect trunk lid latch switch connector F-21 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 latch switch connector F-21 for damage.
Q: Is trunk lid latch switch connector F-21 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 latch switch should be able to be checked and the functions, which are described in the "Technical Description (comment)," should work normally.




STEP 4. Check the harness wire between trunk lid latch switch connector F-21 and ground.
Q: Is the harness wire between trunk lid latch switch connector F-21 and ground in good condition?

YES: There is no action to be taken.

NO: Repair it. The input signal from the trunk lid latch switch should be able to be checked and the functions, which are described in the "Technical Description (comment)," should work normally.







STEP 5. Check trunk lid latch switch connector F-21 and ETACS-ECU connector C-81 for damage.
Q: Are trunk lid latch switch connector F-05 and ETACS-ECU connector C-81 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 latch switch should be able to be checked and the functions, which are described in the "Technical Description (comment)," should work normally.










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

NOTE: After checking intermediate connector C-67, check the wires. If intermediate connector C-67 is damaged, repair or replace it. Refer to Harness Connector Inspection.

Q: Are the harness wires between trunk lid latch switch connector F-21 and ETACS-ECU connector C-81 in good condition?

YES: Replace the ETACS-ECU. The input signal from the trunk lid latch switch should be able to be checked and the functions, which are described in the "Technical Description (comment)," should work normally.

NO: Repair them. The input signal from the trunk lid latch switch should be able to be checked and the functions, which are described in the "Technical Description (comment)," should work normally.
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