DTC 30
DTC 30: Adaptive Cruise Control (ACC) Relay Circuit Malfunction1. 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. Do the brake pedal test and adjustment.
3. 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.
4. 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.
5. Test the ACC relay.
Is the relay OK?
YES - Go to step 6.
NO - Replace the relay and recheck.
6. Disconnect the 4P connector from the brake pedal position switch.
7. Measure the 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.
8. Disconnect the ACC unit 20P connector.
9. Measure the voltage between the ACC unit 20P connector No. 1 terminal and body ground.
Is there battery voltage?
YES - Repair a short to power in the wire between the ACC unit and the ACC relay, or between the ACC unit and the brake lights circuits.
NO - Check for loose or poor connections. If OK, replace the ACC unit.
10. Clear the DTCs with the HDS.
11. Turn the ACC switch ON.
12. Check the brake lights with the brake pedal pressed.
Do the brake lights come on?
YES - Go to step 13.
NO - Go to step 36.
13. Check for DTCs with the HDS.
Is DTC 30 indicated?
YES - Go to step 14
NO - Go to step 20.
14. Turn the ignition switch OFF.
15. Remove the ACC relay.
16. Disconnect the 20P connector from the ACC unit.
17. Disconnect the brake pedal position switch 4P connector.
18. Check for continuity between the ACC unit 20P connector No. 1 terminal and body ground.
Is there continuity?
YES - Repair a short to ground in the wire between the ACC unit and the ACC relay.
NO - Go to step 19.
19. Check for continuity between the ACC unit 20P connector No. 1 terminal and ACC relay 5P connector No. 1 terminal.
Is there continuity?
YES - Check for loose or poor connections. If OK, replace the ACC unit.
NO - Repair an open in the wire between the ACC unit and the ACC relay.
20. Test the ACC relay.
Is the relay OK?
YES - Go to step 21.
NO - Replace the relay and recheck.
21. Remove the ACC relay.
22. Measure the voltage between the ACC relay 5P connector No. 2 terminal and body ground.
Is there battery voltage?
YES - Go to step 23.
NO - Repair an open in the wire between the No. 13 (15 A) fuse in the under-hood fuse/relay box and the ACC relay.
23. Turn the ignition switch ON (II).
24. Measure the voltage between the ACC relay 5P connector No. 5 terminal and body ground.
Is there battery voltage?
YES - Go to step 25.
NO - Repair an open in the wire between the No. 29 (10 A) fuse in the under-dash fuse/relay box and the ACC relay.
25. Turn the ignition switch OFF.
26. Disconnect the 20P connector from the ACC unit.
27. Check for continuity between the ACC unit 20P connector No. 16 terminal and body ground.
Is there continuity?
YES - Repair a short to ground in the wire between the ACC unit and the ACC relay.
NO - Go to step 28.
28. Check for continuity between the ACC unit 20P connector No. 16 terminal and ACC relay 5P connector No. 3 terminal.
Is there continuity?
YES - Go to step 29.
NO - Repair an open in the wire between the ACC unit and the ACC relay.
29. Install the ACC relay.
30. Reconnect the ACC unit 20P connector.
31. Clear the DTCs with the HDS.
32. Turn the ignition switch ON (II) and the ACC switch ON.
33. Select ADAPTIVE CRUISE CONTROL (ACC) from the DRIVING SUPPORT menu, then enter ACC RELAY from the FUNCTION TEST menu.
34. Do the ACC relay function test with the HDS.
35. Check for DTCs with the HDS.
Is DTC 30 indicated?
YES - Check for loose or poor connections. If OK, replace the ACC unit.
NO - Troubleshoot the indicated DTC. If there is no DTC, the system is OK at this time.
36. Check for the DTCs with the HDS.
Is DTC 30 indicated?
YES - Go to step 37.
NO - Go to step 43.
37. Do the ACC relay test.
Is the relay OK?
YES - Go to step 38.
NO - Replace the relay and recheck.
38. Remove the ACC relay.
39. Disconnect the ACC unit 20P connector.
40. Disconnect each brake light 3P connector and the high mount brake light 2P connector.
41. Check for continuity between the ACC unit 20P connector No. 1 terminal and body ground.
Is there continuity?
YES - Repair a short to ground in the wire between the ACC unit and the ACC relay.
NO - Go to step 42.
42. Check for continuity between the ACC unit 20P connector No. 1 terminal and ACC relay 5P connector No. 1 terminal.
Is there continuity?
YES - Check for loose or poor connections. If OK, replace the ACC unit.
NO - Repair an open in the wire between the ACC unit and the ACC relay.
43. Check the brake lights with the brake pedal pressed.
Are the LEDs OK?
YES - Intermittent failure, the system is OK at this time. Check for loose or poor connections.
NO - Go to step 44.
44. Do the brake pedal test and adjustment.
45. Test the brake pedal position switch.
46. Check the brake lights with the brake pedal pressed.
Do the brake lights come on?
YES - Intermittent failure, the system is OK at this ti me. Check for loose or poor connections.
NO - Repair an open in the BLK wire or poor ground (G701).