ETACS-ECU Does Not Receive Any Signal From the Liftgate Latch Switch. [Eclipse]

INSPECTION PROCEDURE N-5: ETACS-ECU does not receive any signal from the liftgate latch switch. [ECLIPSE]

Luggage Compartment Light Circuit (Part 1):

Luggage Compartment Light Circuit (Part 2):

CIRCUIT OPERATION
The ETACS-ECU operates the luggage compartment light according to signal from the liftgate latch switch.

TECHNICAL DESCRIPTION (COMMENT)
The liftgate latch switch input signal is used to operate the luggage compartment light. If the signal fails, this function will not work normally.

TROUBLESHOOTING HINTS
- The liftgate latch switch may be defective
- The ETACS-ECU may be defective
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector

DIAGNOSIS

Required Special Tools:
- MB991223: Harness Set
- MB992006: Extra Fine Probe

STEP 1. Check liftgate latch switch connector F-09 for loose, corroded or damaged terminals, or terminals pushed back in the connector.







Q: Is liftgate latch switch connector F-09 in good condition?

YES : Go to Step 2.

NO : Repair or replace the damaged component(s). If the functions described in "CIRCUIT OPERATION" work normally, the input signal from the liftgate latch switch should be normal.

STEP 2. Check the liftgate latch switch.







Remove the liftgate latch switch.







Q: Is the liftgate latch switch in good condition?

YES : Go to Step 3.

NO : Replace the liftgate latch switch. If the functions described in "CIRCUIT OPERATION" work normally, the input signal from the liftgate latch switch should be normal.

STEP 3. Check the ground circuit to the liftgate latch switch. Measure the resistance at liftgate latch switch connector F-09.







1. Disconnect liftgate latch switch connector F-09 and measure the resistance available at the wiring harness side of the connector.







2. Measure the resistance value between terminal 2 and ground.
- The resistance should be 2 ohms or less.

Q: Is the measured resistance 2 ohms or less?

YES : Go to Step 5.

NO : Go to Step 4.

STEP 4. Check the wiring harness between liftgate latch switch connector F-09 (terminal 2) and ground.

- Check the ground wire for open circuit.







Q: Is the wiring harness between liftgate latch switch connector F-09 (terminal 2) and ground in good condition?

YES : No action is necessary and testing is complete.

NO : The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. If the functions described in "CIRCUIT OPERATION" work normally, the input signal from the liftgate latch switch should be normal.

STEP 5. Check ETACS-ECU connector C-218 for loose, corroded or damaged terminals, or terminals pushed back in the connector.







Q: Is ETACS-ECU connector C-218 in good condition?

YES : Go to Step 6.

NO : Repair or replace the damaged component(s). If the functions described in "CIRCUIT OPERATION" work normally, the input signal from the liftgate latch switch should be normal.

STEP 6. Check the wiring harness between liftgate latch switch connector F-09 (terminal 1) and ETACS-ECU connector C-218 (terminal 62).

- Check the communication lines for open circuit and short circuit.













NOTE: Also check intermediate connector C-23 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-23 is damaged, repair or replace the connector.

Q: Is the wiring harness between liftgate latch switch connector F-09 (terminal 1) and ETACS-ECU connector C-218 (terminal 62) in good condition?

YES : Replace the ETACS-ECU. When the ETACS-ECU is replaced, register the encrypted code. If the functions described in CIRCUIT OPERATION" work normally, the input signal from the liftgate latch switch should be normal.

NO : The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. If the functions described in "CIRCUIT OPERATION" work normally, the input signal from the liftgate latch switch should be normal.