DTC Troubleshooting: 61

Adaptive Cruise Control (ACC) Unit DTC 61: Millimeter Wave Radar Unit Communication Error

1. Clear the DTC with the HDS.

1. Turn the ignition switch ON (II).

1. Watch the adaptive cruise control (ACC)/LKAS indicator.

Do the indicator come on?

YES | - | Go to Step 4 .
NO | - | Intermittent failure, the system is OK at this time.■

1. Check for DTCs with the HDS.

Is DTC 61 indicated?

YES | - | Go to Step 5 .
NO | - | Troubleshoot the indicated DTC(s). If there are no DTCs, the system is OK at this time.■

1. Turn the ignition switch OFF.

1. Check the No. 13 (20 A) fuse in the under-dash fuse/relay box.

Is the fuse OK?

YES | - | Go to Step 7 .
NO | - | Replace the fuse and recheck.■

1. Disconnect the 5P connector from the millimeter wave radar unit.

1. Turn the ignition switch ON (II).

1. Check for voltage between the millimeter wave radar unit 5P connector No. 1 terminal and body ground.

Is there battery voltage?

YES | - | Go to Step 10 .
NO | - | Repair an open in the wire between the millimeter wave radar unit and the No. 13 (20 A) fuse in the under-dash fuse/relay box.■

1. Turn the ignition switch OFF.

1. Check for continuity between the millimeter wave radar unit 5P connector No. 4 terminal and body ground.

Is there continuity?

YES | - | Go to Step 12 .
NO | - | Repair an open in the wire or poor ground (G203).■

1. Turn the ignition switch ON (II) and main switch ON.

1. Check for voltage between the millimeter wave radar unit 5P connector No. 5 terminal and body ground.

Is there battery voltage?

YES | - | Go to Step 15 .
NO | - | Go to Step 14 .

1. Check for voltage between the adaptive cruise control (ACC) unit 20P connector No. 17 terminal and body ground.

Is there battery voltage?

YES | - | Repair an open in the wire between the adaptive cruise control (ACC) unit and the millimeter wave radar unit.■
NO | - | Check for loose or poor connections. If OK, replace the adaptive cruise control (ACC) unit , then go to Step 18 .

1. Turn the ignition switch OFF.

1. Disconnect the 20P connector from the adaptive cruise control (ACC) unit.

1. Check for continuity between the millimeter wave radar unit 5P connector No. 5 terminal and body ground.

Is there continuity?

YES | - | Repair a short to ground in the wire between the adaptive cruise control (ACC) unit and the millimeter wave radar unit.■
NO | - | Check for loose or poor connections. If OK, replace the adaptive cruise control (ACC) unit , then go to Step 18 .

1. Clear the DTCs with the HDS.

1. Turn the ignition switch ON (II).

1. Watch the adaptive cruise control (ACC) indicator.

Do the indicator come on?

YES | - | Go to Step 21 .
NO | - | Intermittent failure, the system is OK at this time.■

1. Check for DTCs with the HDS.

Is DTC 61 indicated?

YES | - | Check for loose or poor connections. If OK, Replace the millimeter wave radar unit. After replacement, do the millimeter wave radar unit aiming procedure. ■
NO | - | Troubleshoot the indicated DTC(s). If there are no DTCs, the system is OK at this time.■