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Inspection Procedure O-10

Driver's Or Passenger's Door Switch Input Circuit:






CIRCUIT OPERATION
The ETACS-ECU operates various functions according to the input signal from the driver's or passenger's door switch.

TECHNICAL DESCRIPTION (COMMENT)
The driver's or passenger's door switch is used to operate the following devices or functions. If the signal fails, these devices will not work normally.
- Ignition key reminder tone alarm function (driver's door switch only)
- Light reminder tone alarm function (driver's door switch only)
- Forgotten key prevention function
- Keyless entry system
- Power window timer function
- Sunroof timer function
- Headlight automatic shutdown function (driver's door switch only)
- Theft-alarm system

TROUBLESHOOTING HINTS
- Malfunction of the driver's or passenger's door switch
- 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 door switch.
If the door switch is damaged, replace it.
The driver's and passenger's door switch input signal should be able to be checked and the functions, which are described in the "Technical Description (comment)," should work normally.
If the driver's door switch is not defective, go to Step 2.
If the passenger's door switch is not defective, go to Step 4.




STEP 2. Check the driver's door switch installation state.

NOTE: The driver's door switch is grounded to the body through the mounting screws.

Remove the cap and measure the resistance between the lower metal part and the ground.
- Should be less than 2 Ohms.

If open circuit, check the installation state and repair. The driver's door switch input signal should be able to be checked and the functions, which are described in the "Technical Description (comment)," should work normally.

If less than 2 Ohms. go to Step 3.







STEP 3. Check the driver's door switch connector D-11 and ETACS-ECU connector C-114 for damage.
If the driver's door switch connector D-11 and ETACS-ECU connector C-114 are damaged, repair or replace them. Refer to Harness Connector Inspection. The driver's door switch input signal should be able to be checked and the functions, which are described in the "Technical Description (comment)," should work normally.
If the connectors are in good condition, go to Step 4.







STEP 4. Check the harness wires between driver's door switch connector D-11 and ETACS-ECU connector C-114.

NOTE: After checking junction block connector C-113, check the wires. If junction block connector C-113 is damaged, repair or replace it. Refer to Harness Connector Inspection.

If the harness wires between driver's door switch connector D-11 and ETACS-ECU connector C-114 are damaged, repair them.

The driver's door switch input signal should be able to be checked and the functions, which are described in the "Technical Description (comment)," should work normally.

If the harness wires are in good condition, replace the ETACS-ECU.
The driver's door switch input signal should be able to be checked and the functions, which are described in the "Technical Description (comment)," should work normally.




STEP 5. Check the passenger's door switch installation state.

NOTE: The passenger's door switch is grounded to the body through the mounting screws.

Remove the cap and measure the resistance between the lower metal part and the ground.
- Should be less than 2 Ohms.

If open circuit, check the installation state and repair.
The passenger's door switch input signal should be able to be checked and the functions, which are described in the "Technical Description (comment)," should work normally.

If less than 2 Ohms. go to Step 6.







STEP 6. Check the passenger's door switch connector D-01 and ETACS-ECU connectors C-111 and C-114 for damage.
If the passenger 5 door switch connector D-01 and ETACS-ECU connectors C-111 and C-114 are damaged, repair or replace them. Refer to Harness Connector Inspection.

The passenger's door switch input signal should be able to be checked and the functions, which are described in the "Technical Description (comment)," should work normally.

If the connectors are in good condition, go to Step 7.













STEP 7. Check the harness wires between passenger's door switch connector D-01 and ETACS-ECU connectors C-111 and C-114.

NOTE: After checking intermediate connector C-92 and junction block connector C-104, check the wires. If intermediate connector C-92 and junction block connector C-104 are damaged, repair or replace them. Refer to Harness Connector Inspection.

If the harness wires between passenger's door switch connector D-01 and ETACS-ECU connectors C-111 and C-114 are damaged, repair them.
The passenger's door switch input signal should be able to be checked and the functions, which are described in the "Technical Description (comment)," should work normally.
If the harness wires are in good condition, replace the ETACS-ECU.
The passenger's door switch input signal should be able to be checked and the functions, which are described in the "Technical Description (comment)," should work normally.
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