54A-THE FRONT DOOR SWITCH (LH) SIGNAL IS NOT SENT TO THE ETACS-ECU.

Inspection Procedure 5: ETACS-ECU does not receive any signal from the front door switch (LH).

TECHNICAL DESCRIPTION (COMMENT)

If there is an error to the front door switch (LH) input signal, the front door switch (LH) signal is no longer output to the communication line.

TROUBLESHOOTING HINTS

The front door switch (LH) 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 front door switch (LH) connector D-27 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Is front door switch (LH) connector D-27 in good condition?

Go to Step 2

Repair or replace the damaged component(s). Refer to GROUP 00E, Harness Connector Inspection

. Check that the input signal of front door switch (LH) is normal.

STEP 2. Check the front door switch (LH).

Remove the front door switch (LH). Then check the continuity between the switch terminals and the switch body.

Switch position	Tester connection	Specified condition
Released	3 - switch body	Less than 2 ohms
Pressed	3 - switch body	Open circuit

Is the driver's door switch in good condition?

Go to Step 3

Replace the front door switch (LH). Check that the input signal of front door switch (LH) is normal.

STEP 3. Measure at the lower metal part of the front door switch (LH) in order to check the ground circuit to the front door switch (LH).

note	Check that the front door switch (LH) is grounded to the vehicle body by means of its mounting screw.

Remove the cap, and measure the resistance value between the lower metal part and the ground.

The resistance should equal 2 ohms or less.

Is the measured resistance 2 ohms or less?

Go to Step 4

Check the fit of the switch, and repair if necessary. Check that the input signal of front door switch (LH) is normal.

STEP 4. Check ETACS-ECU connector C-412 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Is ETACS-ECU connector C-412 in good condition?

Go to Step 5

Repair or replace the damaged component(s). Refer to GROUP 00E, Harness Connector Inspection

. Check that the input signal of front door switch (LH) is normal.

STEP 5. Check the wiring harness between driver's door switch connector D-27 (terminal 3) and ETACS-ECU connector C-412 (terminal 16).

Check the input lines for open circuit and short circuit.

Is the wiring harness between driver's door switch connector D-27 (terminal 3) and ETACS-ECU connector C-412 (terminal 16) in good condition?

Replace the ETACS-ECU. Check that the input signal of front door switch (LH) is normal.

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. Check that the input signal of front door switch (LH) is normal.