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Inspection Procedure 5

Ignition Key Hole Illumination Light Circuit:





CIRCUIT OPERATION
- The ETACS-ECU monitors the ignition switch by detecting voltage from the ignition switch.
- The ETACS-ECU judges that the driver's side door is opened or closed by detecting voltage from the front door switch (LH).
- The ETACS-ECU judges that the ignition key is inserted or removed by detecting voltage from the key reminder switch.
- When the driver's door is opened (door switch ON), the ignition key hole illumination light will illuminate. When the driver's door is closed (door switch OFF), the ignition key hole illumination light will go out within 15 seconds.

TECHNICAL DESCRIPTION (COMMENT)
It is possible that there is a malfunction in the input signal from the door switch or the key reminder switch if the ignition key hole illumination light does not illuminate.

TROUBLESHOOTING HINTS
- malfunction of the driver's side door switch
- malfunction of the bulb
- malfunction of the connector
- Damaged harness wire
- malfunction of the ETACS-ECU

DIAGNOSIS
Required Special Tool:
MB991502: Scan Tool (MUT-II)

STEP 1. Check the input signal from the driver's side door switch.

CAUTION: To prevent damage to scan tool MB991502, turn the ignition switch "OFF" before connecting or disconnecting it.




1. Connect scan tool MB991502, to the data link connector.
2. Check that the tone alarm of the scan tool MB991502 sounds when the driver's side door is opened.
If the tone alarm of the scan tool MB991502 does not sound, there may be a malfunction in the input signal from the driver's side door switch. Go to Step 2.

If the tone alarm of the scan tool MB991502 sounds when the driver's side door is opened [front door switch (LH) is turned to ON], the input signal from the driver's side door switch to the scan tool MB991502 is normal. Replace the ETACS-ECU. Check that the malfunction is eliminated.

STEP 2. Check the driver's side door switch.
1. Remove the driver's side door switch. Refer to Door.







2. Check the continuity of the driver's side door switch.
If the driver's side door switch is in good condition, go to Step 3.

If the driver's side door switch is defective, replace the driver's side door switch. Check that the malfunction is eliminated.




STEP 3. Check the driver's side door switch ground circuit system. Check continuity between the driver's side door switch body (metal section) and ground.
- There should be continuity (0 Ohm).

If continuity, go to Step 4.

If no continuity, repair or replace the switch. Check that the malfunction is eliminated.

STEP 4. Check the input signal from the driver's side door switch.
1. Disconnect driver's side door switch connector E-33 and measure at the harness side.




2. Measure the voltage between terminal number 2 and ground.
- Voltage should be approximately 5 volts.

If approximately 5 volts, check that the malfunction is eliminated.

If not approximately 5 volts, go to Step 5.




STEP 5. Check the driver's side door switch connector for damage.
If harness connector E-33 is damaged, repair or replace it.Refer to Harness Connector Inspection.

If harness connector E-33 is in good condition, go to Step 6.







STEP 6. Check the harness wires between driver's side door switch connector E-33 and ETACS-ECU connector D-11.
If the harness wires between driver's side door switch connector E-33 and ETACS-ECU connector D-11 are damaged, repair them. Check that the malfunction is eliminated.

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

NOTE: After inspecting junction block connector D-14 and intermediate connector E-42, inspect the wire. If junction block connector D14 and intermediate connector E-24 are damaged, repair or replace them. Refer to Harness Connector Inspection.




STEP 7. Check the continuity of the key reminder switch.
1. Remove the driver's side under cover.
2. Remove the column covers, lower and upper.
3. Disconnect wiring connector D-16 from the key reminder switch and measure at the key reminder switch side.




4. Check the continuity between terminal numbers 4 and 6.
If the key reminder switch is in good condition, go to Step 8.

If the key reminder switch is damaged, replace the key reminder switch. Check that the malfunction is eliminated.




STEP 8. Check the input signal from the key reminder switch.
1. Remove the driver's side under cover.
2. Remove the column covers, lower and upper.
3. Disconnect wiring connector D-16 from the key reminder switch and measure at the harness side.
4. Check that the tone alarm stops sounding when terminal number 6 is grounded.
If the tone alarm stops sounding, go to Step 9.

If the tone alarm does not stop sounding, go to Step 10.




STEP 9. Check harness connector D-16 at the key reminder switch for damage.
If harness connector D-16 is damaged, repair or replace it. Refer to Harness Connector Inspection. Check that the malfunction is eliminated.

If harness connector D-16 is in good condition, go to Step 10.




STEP 10. Check the harness wires between key reminder switch connector 10-16 and body ground.
If the harness wires between key reminder switch connector D-16 and body ground are damaged, repair them. Check that the malfunction is eliminated.

If the harness wires are in good condition, replace the ETACS-ECU or tone alarm-ECU. Go to Step 11.







STEP 11. Check the harness wires between key reminder switch connector 10-16 and ETACS-ECU connector D-11.
If the harness wires between the key reminder switch connector D-16 and ETACS-ECU connector D-11 are damaged, repair them. Check that the malfunction is eliminated.

If the harness wires are in good condition, replace the ETACS-ECU. Check that the malfunction is eliminated.

NOTE: After inspecting junction block connector D-13, inspect the wire. If junction block connector D-13 is damaged, repair or replace it. Refer to Harness Connector Inspection.

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