4. Substitute a known-good yaw rate-lateral/longitudinal acceleration sensor See: Brakes and Traction Control/Antilock Brakes / Traction
Control Systems/Yaw Rate Sensor/Service and Repair.
5. Turn the ignition switch to ON (II).
6. Clear the DTC with the HDS.
7. Test-drive the vehicle. Drive the vehicle at 19 mph(30 km/h) or more, and go a distance of 985 ft (300 m) or more.
8. Check for DTCs with the HDS.
Is DTC 25, 26, or 28 indicated?
YES -
Go to step 9.
NO -
Replace the original yaw rate-lateral/longitudinal acceleration sensor See: Brakes and Traction Control/Antilock Brakes / Traction Control
Systems/Yaw Rate Sensor/Service and Repair.?
9. Update the VSA modulator-control unit if it does not have the latest software See: Brakes and Traction Control/Antilock Brakes / Traction
Control Systems/Traction Control Module/Testing and Inspection. If the unit already has the latest software, substitute a known-good VSA
modulator-control unit See: Brakes and Traction Control/Antilock Brakes / Traction Control Systems/Traction Control Module/Service and
Repair.
10. Turn the ignition switch to LOCK (0), then turn it to ON (II) again.
11. Test-drive the vehicle. Drive the vehicle at 19 mph(30 km/h) or more, and go a distance of 985 ft (300 m) or more.
12. Check for DTCs with the HDS.
Is DTC 25, 26, or 28 indicated?
YES -
Check for loose terminals in the VSA modulator-control unit 46P connector. Check for a loose connection at G303. If the VSA modulator-control
unit was updated, substitute a known-good VSA modulator-control unit See: Brakes and Traction Control/Antilock Brakes / Traction Control
Systems/Traction Control Module/Service and Repair, then retest. If the VSA modulator-control unit was substituted, go to step 1.
NO -
If the VSA modulator-control unit was updated, troubleshooting is complete. If the VSA modulator-control unit was substituted, replace the
original VSA modulator-control unit See: Brakes and Traction Control/Antilock Brakes / Traction Control Systems/Traction Control
Module/Service and Repair. If any other DTCs are indicated, go to the indicated DTCs troubleshooting.?
30
Adaptive Cruise Control (ACC) DTC Troubleshooting: 30
DTC 30:
Brake Light Relay Circuit Malfunction
1. Check the brake lights without pressing the brake pedal.
Are the brake lights off?
YES -
Go to step 10.
NO -
Go to step 2.
2. Check the brake pedal height, and adjust it if needed See: Brakes and Traction Control/Brake Pedal Assy/Adjustments.
3. Check the brake lights without pressing the brake pedal.
