DTC Troubleshooting: 61

Adaptive Cruise Control (ACC) Unit DTC 61: Millimeter Wave Radar Unit Communication Error Clear the DTC with the HDS. Turn the ignition switch ON (II). 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.■
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.■
Turn the ignition switch OFF. 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.■
Disconnect the 5P connector from the millimeter wave radar unit. Turn the ignition switch ON (II). 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.■
Turn the ignition switch OFF. |

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).■
Turn the ignition switch ON (II) and main switch ON. |

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 .

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 .
Turn the ignition switch OFF. Disconnect the 20P connector from the adaptive cruise control (ACC) unit. |

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 .
Clear the DTCs with the HDS. Turn the ignition switch ON (II). 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.■
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.■