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 and CMBS indicator.
Do both 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).
- Measure the voltage between the millimeter wave, radar unit 5P connector No. 1 terminal and body ground.Fig 1: Measuring Voltage Between Millimeter Wave, Radar Unit 5P Connector No. 1 Terminal And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
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.Fig 2: Checking For Continuity Between Millimeter Wave Radar Unit 5P Connector No. 4 Terminal And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES - Go to step 12.
NO - Repair an open in the wire or poor ground (G401).
- Turn the ignition switch ON (II) and ACC switch ON.
- Measure the voltage between the millimeter wave radar unit 5P connector No. 5 terminal and body ground.Fig 3: Measuring Voltage Between Millimeter Wave Radar Unit 5P Connector No. 5 Terminal And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there battery voltage?
YES - Go to step 15.
NO - Go to step 14.
- Measure the voltage between the ACC unit 20P connector No. 17 terminal and body ground.
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there battery voltage?
YES - Repair an open in the wire between the ACC unit and the millimeter wave radar unit.
NO - Check for loose or poor connections. If OK, replace the ACC unit (see DISTANCE SWITCH TEST ), then go to step 18.
- Turn the ignition switch OFF.
- Disconnect the 20P connector from the ACC unit.
- Check for continuity between the millimeter wave radar unit 5P connector No. 5 terminal and body ground.Fig 5: Checking For Continuity Between Millimeter Wave Radar Unit 5P Connector No. 5 Terminal And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES - Repair a short to ground in the wire between the ACC unit and the millimeter wave radar unit.
NO - Check for loose or poor connections. If OK, replace the ACC unit (see DISTANCE SWITCH TEST ), then go to step 18.
- Clear the DTCs with the HDS.
- Turn the ignition switch ON (II).
- Watch the ACC indicator and CMBS indicator.
Do both 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 (see MILLIMETER WAVE RADAR UNIT REMOVAL/INSTALLATION ). After replacement, aim the millimeter wave radar unit (see MILLIMETER WAVE RADAR UNIT AIMING ).
NO - Troubleshoot the indicated DTC(s). If there are no DTCs, the system is OK at this time.