DTC Troubleshooting: 30
DTC 30:
 Adaptive Cruise Control (ACC) Relay Circuit Malfunction
NOTE: Information marked with an asterisk ( *1 ) applies to RHD model, and asterisk ( *2 ) applies to LHD model.
  1. Check the brake lights without pressing the brake pedal.
Are the brake lights off?
YES -
Go to Step 12 .
NO -
Go to Step 2 .
  1. Do the brake pedal adjustment.
  1. Check the brake lights without pressing the brake pedal.
Are the brake lights off?
YES -
Intermittent failure. The system is OK at this time. Check for loose or poor connections.■
NO -
Go to Step 4 .
  1. Test the brake pedal position switch.
Is the brake pedal position switch OK?
YES -
Go to Step 5 .
NO -
Adjust or replace the brake pedal position switch and recheck. ■
  1. Test the relay circuit board.
Is the relay circuit board OK?
YES -
Go to Step 6 .
NO -
Replace the under-hood fuse/relay box and recheck.■
  1. Disconnect the 4P connector from the brake pedal position switch.
  1. Check for voltage between the brake pedal position switch 4P connector No. 2 terminal and body ground.
Is there battery voltage?
YES -
Repair a short to power in the wire.■
NO -
Go to Step 8 .
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect the ACC unit 20P connector.
  1. Turn the ignition switch to ON (II).