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Inspection Procedure O-4

INSPECTION PROCEDURE O-4: ETACS-ECU Does Not Receive One Of Signal From The Driver's Or The Front Passenger's Door Switch.

Front Door Switches Input Circuit (Part 1):




Front Door Switches Input Circuit (Part 2):






CIRCUIT OPERATION
The ETACS-ECU operates the following functions or systems according to signal from the front door switches:
- Ignition key reminder tone alarm function [front door switch (LH)]
- Light reminder tone alarm function [front door switch (LH)]
- Door ajar warning tone alarm
- Forgotten key reminder
- Power window timer function
- Sunroof timer function [front door switch (LH)]
- Keyless entry system
- Timed locking mechanism
- Headlight automatic shutdown function [front door switch (LH)]
- Dome light
- Interior light automatic-shutdown function
- Ignition key hole illumination light [front door switch (LH)]
- Door-ajar indicator light
- Theft-alarm system

TECHNICAL DESCRIPTION (COMMENT)
If the signal is not normal, the functions or systems described in "CIRCUIT OPERATION" do not work normally. If the signal is not normal, the front door switches or the ETACS-ECU may be defective.

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

DIAGNOSIS

Required Special Tools:
- MB991223: Harness Set
- MB992006: Extra Fine Probe
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A

STEP 1. Check the input signal (by using the pulse check mode of the monitor).

Check the input signals from the front door switches.

CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.






1. Connect the scan tool MB991958. Refer to "How to connect SWS monitor". How to Connect SWS Monitor
2. Operate scan tool MB991958 according to the procedure below to display "Pulse check".
a. Select "Interactive Diagnosis".
b. Select "System select".
c. Select "SWS".
d. Select "Pulse Checking".

3. Check that scan tool MB991958 sounds.

Q: Does scan tool MB991958 sound when each front door is opened and closed?

When the front door (LH) is opened and closed, scan tool MB991958 does not sound.: Go to Step 2.

When the front door (RH) is opened and closed, scan tool MB991958 does not sound.: Go to Step 7.

When either front door is opened and closed, scan tool MB991958 sounds.: 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 front door switches should be normal.

STEP 2. Check front door switch (LH) connector D-25 for loose, corroded or damaged terminals, or terminals pushed back in the connector.






Q: Is front door switch (LH) connector D-25 in good condition?

YES: Go to Step 3.

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

STEP 3. Check the front door switch (LH).






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






Q: Is the front door switch (LH) in good condition?

YES: Go to Step 4.

NO: Replace the front door switch (LH). If the functions described in "CIRCUIT OPERATION" work normally, the input signal from the front door switch (LH) should be normal.

STEP 4. Measure resistance 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 via of its mounting screw. Remove the cap, and measure the resistance value between the lower metal part 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: Check the installation of the switch, and repair if necessary. If the functions described in "CIRCUIT OPERATION" work normally, the input signal from the front door switch (LH) should be normal.

STEP 5. Check ETACS-ECU connector C-219 for loose, corroded or damaged terminals, or terminals pushed back in the connector.






Q: Is ETACS-ECU connector C-219 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 front door switch (LH) should be normal.

STEP 6. Check the wiring harness between front door switch (LH) connector D-25 (terminal 1) and ETACS-ECU connector C-219 (terminal 10).

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














NOTE: Also check junction block connector C-204 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If junction block connector C-204 is damaged, repair or replace the damaged component(s).

Q: Is the wiring harness between front door switch (LH) connector D-25 (terminal 1) and ETACS-ECU connector C-219 (terminal 10) 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 front door switch (LH) 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 front door switch (LH) should be normal.

STEP 7. Check front door switch (RH) connector D-35 for loose, corroded or damaged terminals, or terminals pushed back in the connector.






Q: Is front door switch (RH) connector D-35 in good condition?

YES: Go to Step 8.

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

STEP 8. Check the front door switch (RH).






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






Q: Is the front door switch (RH) in good condition?

YES: Go to Step 9.

NO: Replace the front door switch (RH). If the functions described in "CIRCUIT OPERATION" work normally, the input signal from the front door switch (RH) should be normal.

STEP 9. Measure resistance at the lower metal part of the front door switch (RH) in order to check the ground circuit to the front door switch (RH).

NOTE: Check that the front door switch (RH) is grounded to the vehicle body via of its mounting screw.






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

- The resistance should be 2 ohms or less.

Q: Is the measured resistance 2 ohms or less?

YES: Go to Step 10.

NO: Check the installation of the switch, and repair if necessary. If the functions described in "CIRCUIT OPERATION" work normally, the input signal from the front door switch (RH) should be normal.

STEP 10. 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 11.

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

STEP 11. Check the wiring harness between front door switch (RH) connector D-35 (terminal 1) and ETACS-ECU connector C-218 (terminal 65).

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














NOTE: Also check intermediate connector C-112 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-112 is damaged, repair or replace the damaged component(s).

Q: Is the wiring harness between front door switch (RH) connector D-35 (terminal 1) and ETACS-ECU connector C-218 (terminal 65) 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 front door switch (RH) 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 front door switch (RH) should be normal.
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