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H - Charts



Ignition Key Hole Illumination: Ignition Key Hole Illumination Light does not Illuminate or Go Out Normally.

Ignition Key Hole Illumination Light Circuit:






CIRCUIT OPERATION
- When the driver's door is opened with the ignition switch at "ACC" position, the ETACS-ECU illuminates the ignition key hole illumination light.
- The ignition key hole illumination light goes out in 30 seconds after the driver's door is closed. The ignition key hole illumination light remains illuminated for 30 seconds after the ignition key is pulled out.
- The ETACS-ECU operates the ignition key hole illumination light according to the input signals from the following switches:
- Ignition switch (IG1): OFF
- Key reminder switch: OFF
- Interior light loaded signal: ON

- Vehicle condition:
- Ignition switch: "LOCK" (OFF) or "ACC" position
- Ignition key: Removed from the ignition key cylinder
- Driver's door: Opened, or close

TECHNICAL DESCRIPTION (COMMENT)
Is the ignition key hole illumination light does not illuminate, the input circuits from the switches described in "CIRCUIT OPERATION", the key reminder switch (ignition key hole illumination light bulb) or the ETACS-ECU may be defective.

TROUBLESHOOTING HINTS
- Malfunction of the driver's door switch
- Malfunction of the key reminder switch (key reminder switch or ignition key hole illumination light bulb)
- Malfunction of the ETACS-ECU
- Damaged harness wires or connectors

DIAGNOSIS

Required Special Tools:
- MB991223: Test Harness Set
- MB991502: Scan Tool (MUT-II)
- MB991862: SWS monitor kit

STEP 1. Use scan tool to select "ECU CHECK" on the SWS monitor display.
Check the ETACS-ECU.

CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502. Also connect SWS monitor kit MB991862 after turning on scan tool MB991502.




1. Connect scan tool MB991502 to the data link connector.




2. Connect SWS monitor kit MB991862 to the column switch connector.
3. When the ignition switch is turned to the "LOCK" (OFF) position, scan tool MB991502 should show "OK" on the "ETACS ECU" menu.

Q: Is "OK" displayed on the "ETACS ECU" menu?

YES: Go to Step 2.

NO: Refer to Inspection Procedure A-3 "Communication with ETACS-ECU is impossible."










STEP 2. Check the input signal by using service data of the SWS monitor.
Check the input signals from the following switches:
- Ignition switch: OFF
- Driver's door: open
- Select "ETACS ECU" (DATALIST), and check that normal conditions are displayed on the items described in the table.

Q: Does the scan tool display the items "IG SW (IG1)" and "DR DOOR SW" as normal condition?

YES: Go to Step 3.

NO:
- Normal condition is not displayed "IG SW (IG1)": Refer to Inspection Procedure N-2 "ETACS-ECU does not receive a signal from the ignition switch (IG1)."
- Normal condition is not displayed "DR DOOR SW": Refer to Inspection Procedure N-4 "ETACS-ECU does not receive a signal from the driver's or the front passenger's door switch."







STEP 3. Check the input signal (by using the Pulse check).
Check the following switches and input signals:
- Key reminder switch
- Interior light loaded signal

If the switches which are applicable for the input signal check, are operated, check if scan tool MB991502 sounds or not.

Q: When the key reminder switch and the interior light are operated, does scan tool MB991502 sound in each case?

YES: Go to Step 4.

NO: - Scan tool MB991502 does not sound when the ignition key is removed and reinserted: Refer to Inspection Procedure O-1 "ETACS-ECU does not receive a signal from the key reminder switch."
- When one of the interior lights is illuminated, scan tool MB991502 does not sound: Refer to Inspection Procedure O-12 "ETACS-ECU does not receive a interior light loaded signal."




STEP 4. Check at ETACS-ECU connector C-94 in order to check the line from the ignition key hole illumination light.
1. Disconnect ETACS-ECU connector C-94, and measure at the wiring harness side.
2. Connect terminal No.69 to ground.

Q: Does the ignition key hole illumination light illuminate?

YES: Replace the ETACS-ECU. Check that the ignition key hole illumination light illuminates normally.

NO: Go to Step 5.

STEP 5. Check the ignition key hole illumination light bulb.

Q: Is the ignition key hole illumination light bulb in good condition?

YES: Go to Step 6.

NO: Replace the bulb. Check that the ignition key hole illumination light illuminates normally.




STEP 6. Check the key reminder switch (ignition key hole illumination).
1. Disconnect key reminder switch connector C-59.
2. Remove the ignition key hole illumination light bulb. Then measure the resistance value between the bulb terminals.
3. Install a bulb to the key remainder switch, and measure the resistance between connector C-59 terminal Nos.1 and 2.
The measured resistance value should be roughly the same as the value measured in Step (2).

Q: Are these two resistance values extremely different?

YES: Replace the key reminder switch. Check that the ignition key hole illumination light illuminates normally.

NO: (much the same): Go to Step 7.




STEP 7. Measure at key reminder switch connector C-59 in order to check the fusible link (1) line of the power supply to the key reminder switch (ignition key hole illumination light).
1. Disconnect key reminder switch connector C-59, and measure at the wiring harness side.
2. Measure the voltage between terminal 2 and ground.
- The measured value should be approximately 12 volts (battery positive voltage).

Q: Does the measured voltage correspond with this range?

YES: Go to Step 10.

NO: Go to Step 8.







STEP 8. Check key reminder switch connector C-59 and ETACS-ECU connector C-94 for damage.

Q: Are key reminder switch connector C-59 and ETACS-ECU connector C-94 in good condition?

YES: Go to Step 9.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that the ignition key hole illumination light illuminates normally.










STEP 9. Check the wiring harness between key reminder switch connector C-59 and ETACS-ECU connector C-94.

NOTE: Also check joint connector C-57. If joint connector C-57 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Is the wiring harness between key reminder switch connector C-59 and ETACS-ECU connector C-94 in good condition?

YES: No action to be taken.

NO: Repair the wiring harness. Check that the ignition key hole illumination light illuminates normally.







STEP 10. Check key reminder switch connector C-59 and ETACS-ECU connector C-94 for damage.

Q: Are key reminder switch connector C-59 and ETACS-ECU connector C-94 in good condition?

YES: Go to Step 11.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that the ignition key hole illumination light illuminates normally.







STEP 11. Check the wiring harness between key reminder switch connector C-59 and ETACS-ECU connector C-94.

Q: Is the wiring harness between key reminder switch connector C-59 and ETACS-ECU connector C-94 in good condition?

YES: Replace the ETACS-ECU. Check that the ignition key hole illumination light illuminates normally.

NO: Repair the wiring harness. Check that the ignition key hole illumination light illuminates normally.
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