DTC Troubleshooting: 61

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) indicator. Do the indicators 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. 29 (7.5 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. 29 (7.5 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 (G202).■
Turn the ignition switch ON (II) and adaptive cruise control (ACC) 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 indicators 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. ■
NO | - | Troubleshoot the indicated DTC(s). If there are no DTCs, the system is OK at this time.■