2. Auto-Cruise Control Does Not Cancel.

Stoplight Switch Circuit:

Connectors:

CIRCUIT OPERATION
This is the stoplight switch input signal circuit. The signal is sent to the stoplight switch from fusible link 2 via multi-purpose fuse 3, and is then sent to the auto-cruise control-ECU.

TECHNICAL DESCRIPTION (COMMENT)
The cause is probably a malfunction of the stoplight switch circuit.

TROUBLESHOOTING HINTS
- Malfunction of the stoplight switch.
- Damaged connector and harness.
- Malfunction of the auto-cruise control-ECU.

DIAGNOSIS

STEP 1. Check if the stoplight illuminates.
If the stoplight illuminates, go to Step 6.
If the stoplight does not illuminate, go to Step 2.




STEP 2. Check the stoplight switch.
1. Disconnect harness connector C-03 at the stoplight switch.
2. Connect an ohmmeter to the stoplight switch, and check continuity when the plunger of the stoplight switch is pushed in and when it is released.
3. The stoplight switch is in good condition if the circuit is open when the plunger is pushed in to a depth of within 4 mm (0.2 inch) from the outer case edge surface, and if the resistance value is less than 2 ohms when it is released.




4. The check for continuity should be made at terminals 1 and 2 of the stoplight switch.

If the circuit is open, replace the stoplight switch. Then check that the malfunction is eliminated.

If the stoplight switch is in good condition, go to Step 3.




STEP 3. Check the circuit at stoplight switch connector C-03.
1. Disconnect stoplight switch connector C-03 and measure at the harness side.
2. Measure the voltage between terminal 2 and ground.
- Voltage should be system voltage.

If system voltage, go to Step 6.

If not system voltage, go to Step 4.







STEP 4. Check the harness connector C-03 at stoplight switch connector and C-110 at junction block connector for damage.
If harness connectors C-03 and C-110 are damaged, replace them. Refer to Harness Connector Inspection. Then check that the malfunction is eliminated.

If harness connectors C-03 and C-110 are in good condition, go to Step 5.







STEP 5. Check the harness wires between stoplight switch connector C-03 and junction block connector C-110.
If any harness wires between the stoplight switch connector C-03 and junction block connector C-110 are damaged, repair or replace them. Refer to Harness Connector Inspection.
Then check that the malfunction is eliminated.

If the harness wires are in good condition, go to Step 6.









NOTE: After checking intermediate connectors C-89 and C-101; inspect the wire. If the intermediate connectors C-89 and C-107 are damaged, repair or replace them. Refer to Harness Connector Inspection. Check that the malfunction is eliminated.




STEP 6. Check harness connector C-20 at the auto-cruise control-ECU for damage.
If harness connector C-20 is damaged, replace it. Refer to Harness Connector Inspection.
Then check that the malfunction is eliminated.

If harness connector C-20 is in good condition, go to Step 7.







STEP 7. Check the harness wires between stoplight switch connector C-03 and auto-cruise control-ECU connector C-20.
If any harness wires between the stoplight switch connector
C-03 and auto-cruise control-ECU connector C-20 are damaged, repair or replace them. Refer to Harness Connector Inspection.
Then check that the malfunction is eliminated.

If the harness wires are in good condition, replace the auto-cruise control-ECU. Then check that the malfunction is eliminated.






NOTE: After checking intermediate connector C-89, inspect the wire. If the intermediate connector C-89 is damaged, repair or replace it Refer to Harness Connector Inspection. Then check that the malfunction is eliminated.