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Symptom Procedures

Light Reminder Alarm Circuit:




The Light Reminder Alarm Does Not Sound Under the Following Conditions While Taillights or Headlights Illuminate.

When the Ignition Switch Is Turned "OFF" and the Driver's Side Door is Open.

Connectors:




CIRCUIT OPERATION
- The ETACS-ECU judges the state of the ignition switch by detecting voltage from the ignition switch.
- The ETACS-ECU judges whether the driver's side door is opened or closed by detecting the front door switch (LH) signal.
- The ETACS-ECU judges whether the ignition switch is inserted or removed by detecting the key reminder switch signal.
- The ETACS-ECU judges the state of the column switch (lighting switch) by detecting voltage from the column switch (lighting switch).
- When the driver's door is opened (door switch ON) with the lighting switch in the ON ("TAIL" or "HEAD") position, the tone alarm will sound continuously to remind the driver that the lights

TECHNICAL DESCRIPTION (COMMENT)
The cause is probably an abnormal signal from the lighting switch or a defective driver's side door switch.

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

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




STEP 1. Check the input signal from 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.


Go to Step 2.

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, re-install the driver's side door switch. 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 the 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, replace the driver's side door switch. Check that the malfunction is eliminated.




STEP 4. 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 5.

STEP 5. 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, go to Step 7.

If not approximately 5 volts, 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-1 1 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 D-14 and intermediate connector E-24 are damaged, repair or replace them. Refer to Harness Connector Inspection.

STEP 7. Check the key reminder switch continuity.
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 number 4 and number 6.
If the key reminder switch is in good condition, go to Step 8.

If the key reminder switch is defective, 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 connected to ground.
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. Go to Step 12.

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




STEP 10. Check the harness wires between key reminder switch connector D-16 and body ground.
If the harness wires between key reminder switch connector D-16 and body ground are damaged, repair them. Go to Step 12.

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 D-16 and ETACS-ECU connector D-11.
If the harness wires between 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. Go to Step 12.

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.

STEP 12. Check the input signal from the ignition switch.
1. Remove the ETACS-ECU or tone alarm-ECU and measure at the junction block side (connector D-11).
2. Turn the ignition switch "ON."




3. Measure the voltage between terminal number 3 and body ground.
- Voltage should be approximately 12 volts (battery positive voltage).
If any circuit check made at connector D-11 does not meet specifications, go to Step 13.

If any circuit check made at connector D-11 meets specifications, check that the malfunction is eliminated.




STEP 13. Check ETACS-ECU connector D-11 for damage.
If ETACS-ECU connector D-11 is damaged, repair or replace it. Refer to Harness Connector Inspection.

If ETACS-ECU connector D-11 is in good condition, go to Step 14.




STEP 14. Check the harness wires between the ETACS-ECU connector D-11 and ignition switch (IG1).
If the harness wires between the ETACS-ECU connector D-11 and ignition switch (IG1) are damaged, repair them, go to Step 15.

NOTE: After inspecting junction block connector D-08, inspect the wire. If junction block connector D-08 is damaged, repair or replace it Refer to Harness Connector Inspection.

STEP 15. Check the ETACS-ECU or tone alarm-ECU power supply circuit.
1. Remove the ETACS-ECU or tone alarm-ECU and measure at the junction block side (connector D-11).




2. Measure the voltage between terminal number 2 and body ground
- Voltage should be approximately 12 volts (battery positive voltage).

If any circuit check made at connector D-1 1 does not meet specifications, go to Step 16.

If any circuit check made at connector D-1 1 meets specifications, check that the malfunction is eliminated.




STEP 16. Check the harness wires between ETACS-ECU connector D-11 and fusible link number 6.
If the harness wires between ETACS-ECU connector D-11 and fusible link number 6 are damaged, repair them. Then go to Step 17.









NOTE: After inspecting IOD storage connector A-54X and junction block connector D-01, inspect the wire. If IOD storage connector A-54X or junction block connector D-01 is damaged, repair or replace it.

STEP 17. Check the input signal from the column switch (lighting switch).
1. Remove the ETACS-ECU and measure at the junction block side (connector D-11).

2. Turn the lighting switch ON ("TAIL" or "HEAD" position).




3. Measure the voltage between terminal number 5 and body ground.
- Voltage should be approximately 12 volts (battery positive voltage).

If any circuit check made at connector D-11 does not meet specifications, go to Step 18.

If any circuit check made at connector D-11 meets specifications,check that the malfunction is eliminated.







STEP 18. Check the harness wires between ETACS-ECU connector D-11 and column switch connector D-24.
If the harness wires between ETACS-ECU connector D-11 and column switch connector D-24 are damaged, repair them, check that the malfunction is eliminated.









NOTE: After inspecting joint connector (3) C-70 and junction block connector D-01, inspect the wire. If joint connector (3) C-70 and junction block connector D-01 are damaged, repair or replace them. Refer to Harness Connector Inspection.


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