Inspection Procedure N-7
N-7: the Driver's or Front Passenger's Door Switch or Door Switches Signal Is Not Sent to the ETACS-ECU.Driver's Front Passenger's Or Rear Door Switch Input Circuit <1999 Models>:
Driver's Front Passenger's Or Rear Door Switch Input Circuit <2000 Models>:
Connectors:
CIRCUIT OPERATION
The ETACS-ECU operates various functions according to the input signal from the driver's or front passenger's door switch.
TECHNICAL DESCRIPTION (COMMENT)
The driver's and front passenger's door switch and door switches are used to operate the following devices or systems:
- 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 (driver's and front passenger's door switch only)
- Power window timer function (driver's and front passenger's door switch only)
- Keyless entry system
- Dome light (door switch)
- Theft-alarm system
If the signal fails, these devices will not work normally.
TROUBLESHOOTING HINTS
- Malfunction of the driver's, front passenger's or rear 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.
Q: Is the door switch in good condition?
YES: Go to Step 2.
NO: Replace it. The driver's and front passengers door switch and door switches input signal should be able to be checked and the functions, which are described in the "Technical Description (comment)," should work normally.
STEP 2. Check the door switch Installation state.
NOTE: The 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.
Q: Is the resistance less than 2 ohm?
YES: Go to Step 3.
NO: Check the installation state and repair. The driver's and front passenger's door switch and door switches input signal should be able to be checked and the functions, which are described in the "Technical Description (comment)," should work normally.
STEP 3. Check the location of malfunction.
Q: Which door switch signal is not Input?
Driver's door: Go to Step 4.
Front passenger's door: Go to Step 6.
Rear door (LH): Go to Step 8.
Rear door (RH): Go to Step 10.
STEP 4. Check driver's door switch connector D-21 and ETACS-ECU connector C-86 for damage.
Q: Are driver's door switch connector D-21 and ETACS-ECU connector C-86 in good condition?
YES: Go to Step 5.
NO: 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.
STEP 5. Check the harness wires between driver's door switch connector D-21 and ETACS-ECU connector C-86.
NOTE: After checking junction block connector C-87, check the wires. If junction black connector C-87 is damaged, repair or replace it. Refer to Harness Connector Inspection.
Q: Is the harness wires between the driver's door switch connector D-21 and ETACS-ECU connector C-86 in good condition?
YES: 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.
NO: 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.
STEP 6. Check front passenger's door switch connector D-08 and ETACS-ECU connectors C-82 and C-86 for damage.
Q: Are front passenger's door switch connector D-21 and ETACS-ECU connectors C-82 and C-86 in good condition?
YES: Go to Step 7.
NO: Repair or replace them. Refer to Harness Connector Inspection. The front 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.
STEP 7. Check the harness wires between front passenger's door switch connector D-08 and ETACS-ECU connectors C-82 and C-86.
NOTE: After checking intermediate connector C-71 and junction block connector C-87, check the wires. If intermediate connector C-71 and junction block connector C-87 are damaged, repair or replace them. Refer to Harness Connector Inspection.
Q: Are the harness wires between front passenger's door switch connector D-08 and ETACS-ECU connector C-82 and C-86 in good condition?
YES: 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.
NO: Repair them. The front 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.
STEP 8. Check rear door switch (LH) connector F-14 and ETACS-ECU connector C-86 for damage.
Q: Are driver's door switch connector F-14 and ETACS-ECU connector C-86 in good condition?
YES: Go to Step 9.
NO: Repair or replace them. Refer to Harness Connector Inspection. The rear door (LH) switch input signal should be able to be checked and the functions, which are described in the "Technical Description (comment)," should work normally.
STEP 9. Check the harness wires between rear door switch (LH) connector F-14 and ETACS-ECU connector C-86.
NOTE: After checking junction block connector C-87, check the wires. If junction block connector C-87 are damaged, repair or replace it. Refer to Harness Connector Inspection.
Q: Is the harness wires between the rear door switch (LH) connector F-14 and ETACS-ECU connector C-86 in good condition?
YES: 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.
NO: Repair them. The rear door switch (LH) input signal should be able to be checked and the functions, which are described in the "Technical Description (comment)," should work normally.
STEP 10 Check rear door switch (RH) connector F-08 and ETACS-ECU connectors C-86 for damage.
Q: Are rear door switch (RH) connector F-08 and ETACS-ECU connectors C-86 in good condition?
YES: Go to Step 11.
NO: Repair or replace them. Refer to Harness Connector Inspection. The rear door switch (RH) input signal should be able to be checked and the functions, which are described in the "Technical Description (comment)," should work normally.
STEP 11. Check the harness wires between rear door switch (RH) connector F-08 and ETACS-ECU connectors C-86.
NOTE: After checking intermediate connector C-71 and junction block connector C-78, check the wires. If intermediate connector C-71 and junction block connector C-78 are damaged, repair or replace them. Refer to Harness Connector Inspection.
Q: Are the harness wires between rear door switch (RH) connector F-08 and ETACS-ECU connector C-86 in good condition?
YES: 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.
NO: Repair them. The rear door switch (RH) input signal should be able to be checked and the functions, which are described in the "Technical Description (comment)," should work normally.