Inspection Procedure 6
Auto-cruise Control Indicator Light inside Combination Meter does not Illuminate. (However, Auto-cruise Control is Normal.)Auto-Cruise Control Indicator Light Drive Circuit Part 1:
Auto-Cruise Control Indicator Light Drive Circuit Part 2:
CIRCUIT OPERATION
The power for the auto-cruise indicator in the combination meter is supplied from the ignition switch (IG1). When the auto-cruise control system is operating, the transistor inside the PCM illuminates the auto-cruise indicator through PCM terminal number 13.
COMMENT
The cause is probably the malfunction of the indicator bulb or the malfunction of the connector or harness.
TROUBLESHOOTING HINTS
- Malfunction of the indicator bulb.
- Damaged harness or connector.
- Malfunction of the PCM.
DIAGNOSIS
Required Special Tool:
- MB991223: Harness Set
STEP 1. Check the auto-cruise control indicator bulb.
1. Remove the combination meter. Refer to Combination Meter Assembly and Vehicle Speed Sensor.
2. Check the auto-cruise control indicator bulb.
Q: Is the bulb blown?
YES: Replace the bulb. Then check that the malfunction is eliminated.
NO: Go to Step 2.
STEP 2. Measure the power supply voltage at combination meter connector D-03.
1. Disconnect connector D-03 and measure at the harness side.
2. Turn the ignition switch to the "ON" position.
3. Switch "ON" the auto-cruise control main switch.
4. Measure the voltage between terminal 62 and ground.
- The voltage should measure battery positive voltage.
Q: Is the measured voltage battery positive voltage?
YES: Go to Step 5.
NO: Go to Step 3.
STEP 3. Check combination meter connector D-03 and junction block connector D-210 for looser, corroded or damaged terminals, or terminals pushed back in the connector.
Q: Are the connectors and terminals in good condition?
YES: Go to Step 4.
NO: Repair or replace the damaged components. Refer to Harness Connector Inspection.
STEP 4. Check the harness for open circuit or short circuit to ground between combination meter connector D-03 terminal 62 and junction block connector D-210 terminal 1.
Q: Is the harness wire in good condition?
YES: Go to Step 5.
NO: Repair or replace the harness wire.
STEP 5. Measure the power supply voltage at PCM connector D-132.
1. Disconnect connector D-132 and measure at the harness side.
2. Turn the ignition switch to the "ON" position.
3. Switch "ON" the auto-cruise control main switch.
4. Measure the voltage between terminal 13 and ground.
- The voltage should measure battery positive voltage.
Q: Is the measured voltage battery positive voltage?
YES: Replace the PCM. Refer to Auto-cruise Control.
NO: Go to Step 6.
STEP 6. Check PCM connector D-132, intermediate connector E-110 and combination meter connector D-04 for looser, corroded or damaged terminals, or terminals pushed back in the connector.
Q: Are the connectors and terminals in good condition?
YES: Go to Step 7.
NO: Repair or replace the damaged components. Refer to Harness Connector Inspection.
STEP 7. Check the harness for open circuit or short circuit to ground between PCM connector D-132 terminal 13 and combination meter connector D-04 terminal 45.
Q: Is the harness wire in good condition?
YES: Go to Step 8.
NO: Repair or replace the harness wire.
STEP 8. Check the combination meter.
1. Remove the combination meter and measure at the combination meter side. (Refer to Combination Meter Assembly and Vehicle Speed Sensor.)
2. Measure the continuity between combination meter connector D-03 terminal 62 and combination meter connector D-04 terminal 45.
- The resistance should measure less than 2 Ohms.
Q: Is the resistance less than 2 Ohms?
YES: Replace the PCM. Refer to Auto-cruise Control.
NO: Replace the combination meter. Refer to Combination Meter Assembly and Vehicle Speed Sensor.