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Inspection Procedure N-8

Driver's or Front Passenger's Door Lock Key Cylinder Switch Input Circuit:




Connectors:






CIRCUIT OPERATION
The ETACS-ECU uses the input signals from the driver's or front passenger's door lock key cylinder switch to operate the following devices or functions.

TECHNICAL DESCRIPTION (COMMENT)
The driver's or front passenger's door lock key cylinder switch input signals are used to operate the following devices or functions. If the signal fails, these devices will not work normally.
- Central door locking system
- Theft-alarm system

TROUBLESHOOTING HINTS
- Malfunction of the driver's or front passenger's door lock key cylinder 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 lock key cylinder switch.
Check the defective door lock key cylinder switch.

If the door lock key cylinder switch is damaged, replace it. The input signal from the driver's and passenger's door lock key cylinder switch should be able to be checked and the functions, which are described in the "Technical Description (comment)," should work normally.

Driver's Door Lock Key Cylinder Switch:




If the driver's door lock key cylinder switch is not defective, go to Step 2.

Front Passenger's Door Lock Key Cylinder Switch:




If the front passenger's door lock key cylinder switch is not defective, go to Step 7.




STEP 2. Check the driver's door lock key cylinder switch ground circuit at driver's door lock key cylinder switch connector E-14.
1. Disconnect driver's door lock key cylinder switch connector E-14 and measure at the harness side.
2. Resistance between terminal 2 and ground.
- Should be less than 2 Ohms.
If open circuit, go to Step 3.
If less than 2 Ohms, go to Step 5.




STEP 3. Check the driver's door lock key cylinder switch connector E-14 for damage.
If driver's door lock key cylinder switch connector E-14 is damaged, repair or replace it. Refer to Harness Connector Inspection.

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

If the connector is in good condition, go to Step 4.







STEP 4. Check the harness wires between driver's door lock key cylinder switch connector E-14 and ground.

NOTE: After checking intermediate connector C-68, check the wires. If intermediate connector C-68 is damaged, repair or replace it. Refer to Harness Connector Inspection.

If the harness wires between driver's door lock key cylinder switch connector E-14 and ground are damaged, repair them. The input signal from the driver's door lock key cylinder switch should be able to be checked and the functions, which are described in the "Technical Description (comment)," should work normally.







STEP 5. Check the driver's door lock key cylinder switch connector E-14 and ETACS-ECU connector C-81 for damage.
If the driver's door lock key cylinder switch connector E-14 and ETACS-ECU connector C-81 are damaged, repair or replace them. Refer to Harness Connector Inspection.

The input signal from the driver's door lock key cylinder switch 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 6.










STEP 6. Check the harness wires between driver's door lock key cylinder switch connector E-14 and ETACS-ECU connector C-81.

NOTE: After checking intermediate connectors C-67 <1999 models only> and C-68, check the wires. If intermediate connectors C-67 <1999 models only> and C-68 are damaged, repair or replace them. Refer to Harness Connector Inspection.

If the harness wires between driver's door lock key cylinder switch connector E-1 4 and ETACS-ECU connector C-81 are damaged, repair them.

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




STEP 7. Check the front passenger's door lock key cylinder switch ground circuit at the front passenger's door lock key cylinder switch connector E-06.
1. Disconnect the front passenger's door lock key cylinder switch connector E-06 and measure at the harness side.
2. Resistance between terminal 2 and ground.
- Should be less than 2 Ohms.
If open circuit, go to Step 8.
If less than 2 Ohms, go to Step 10.




STEP 8. Check the front passenger's door lock key cylinder switch connector E-06 for damage.
If the front passenger's door lock key cylinder switch connector E-06 is damaged, repair or replace it. Refer to Harness Connector Inspection.

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

If the connector is in good condition, go to Step 9.













STEP 9. Check the harness wires between front passenger's door lock key cylinder switch connector E-06 and ground.

NOTE: After checking intermediate connector C-72, check the wires. If intermediate connector C-72 is damaged, repair or replace it. Refer to Harness Connector Inspection.

If the harness wires between front passenger's door lock key cylinder switch connector E-06 and ground are damaged, repair them.

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

STEP 10. Check the front passenger's door lock key cylinder switch connector E-06 and ETACS-ECU connector C-81 for damage.
If the front passenger's door lock key cylinder switch connector E-06 and ETACS-ECU connector C-81 are damaged, repair or replace them. Refer to Harness Connector Inspection.

The input signal from the front passenger's door lock key cylinder switch 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 11.










STEP 11. Check the harness wires between front passenger's door lock key cylinder switch connector E-06 and ETACS-ECU connector C-81.

NOTE: After checking intermediate connector C-69 <1999 models only> and C-72, check the wires. If intermediate connector C-69 <1999 models only> and C-72 are damaged, repair or replace them. Refer to Harness Connector Inspection.

If the harness wires between front passenger's door lock key cylinder switch connector E-06 and ETACS-ECU connector C-81 are damaged, repair them.

The input signal from the front passenger's door lock key cylinder switch 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 input signal from the passenger's door lock key cylinder 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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