DTC : P2583-87 (With Auto Idle Stop)

DTC P2583-87  : Lost Communication With the Millimeter Wave Radar

NOTE:  Before you troubleshoot, review the general troubleshooting information - Refer to:

1. Problem verification

   - 1. Turn the vehicle to the ON mode.

   - 2. Clear the DTC with the HDS.

   Clear DTCs

   - 3. Turn the vehicle to the OFF (LOCK) mode, then the ON mode.

   - 4. Check for DTCs with the HDS.

   Is DTC P2583-87 indicated?

   YES 

   The failure is duplicated. Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Go to intermittent failures troubleshooting - Refer to:

   How to Troubleshoot the Adaptive Cruise Control (ACC) (2016 2017 2018) or

   How to Troubleshoot the Adaptive Cruise Control (ACC) (2019 2020 2021)

   If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the Freeze data/on-board snapshot.

2. Fuse check

   - 1. Turn the vehicle to the OFF (LOCK) mode.

   - 2. Check the following fuse.

   Fuse	No. D3 (7.5 A)
   Location	Auxiliary under-dash fuse/relay box

   Is the fuse OK?

   YES 

   The fuse is OK. Reinstall the fuse, then go to step 3.

   NO 

   Replace the fuse. Turn the vehicle to the ON mode, then the OFF (LOCK) mode. If the fuse blows again, repair a short to ground in the No. D3 (7.5 A) fuse circuit.

3. Open wire check (IG1 ACM (DC/DC) line)

   - 1. Disconnect the following connector.

   Millimeter wave radar 10P connector

   - 2. Turn the vehicle to the ON mode.

   - 3. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode
   	Millimeter wave radar 10P connector: disconnected
   Test point 1	Millimeter wave radar 10P connector terminal No. 5
   Test point 2	Body ground

   Courtesy of HONDA, U.S.A., INC.

   Is there battery voltage?

   YES 

   The IG1 ACM (DC/DC) wire is OK. Go to step 4.

   NO 

   Repair an open in the wire between the millimeter wave radar and the No. D3 (7.5 A) fuse in the auxiliary under-dash fuse / relay box.

4. Open wire check (GND line)

   - 1. Turn the vehicle to the OFF (LOCK) mode.

   - 2. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Millimeter wave radar 10P connector: disconnected
   Test circuit	GND
   Test point 1	Millimeter wave radar 10P connector No. 1
   Test point 2	Body ground

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   The GND wire is OK. Go to step 5.

   NO 

   Repair an open in the wire between the millimeter wave radar and body ground at G204.

5. Open wire check (ACC CAN-L, ACC CAN-H lines)

   - 1. Disconnect the following connector.

   Multipurpose camera unit 20P connector

   - 2. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Multipurpose camera unit 20P connector: disconnected
   	Millimeter wave radar 10P connector: disconnected
   Test point 1	Multipurpose camera unit 20P connector No. 18 - Refer to: Multipurpose Camera Unit Connector for Inputs and Outputs (20106 2017 2018) Multipurpose Camera Unit Connector for Inputs and Outputs (2019 2020 2021)
   Test point 2	Millimeter wave radar 10P connector No. 2

   Test point 1	Multipurpose camera unit 20P connector No. 7 - Refer to: Multipurpose Camera Unit Connector for Inputs and Outputs (20106 2017 2018) Multipurpose Camera Unit Connector for Inputs and Outputs (2019 2020 2021)
   Test point 2	Millimeter wave radar 10P connector No. 3

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   The ACC CAN-L and ACC CAN-H wires are OK. Go to step 6.

   NO 

   Repair an open in the wire between the multipurpose camera unit and the millimeter wave radar.

6. Shorted wire check (ACC CAN-L, ACC CAN-H lines)

   - 1. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Multipurpose camera unit 20P connector: disconnected
   	Millimeter wave radar 10P connector: disconnected
   Test point 1	Millimeter wave radar 10P connector No. 2
   Test point 2	Body ground

   Test point 1	Millimeter wave radar 10P connector No. 3
   Test point 2	Body ground

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   Repair a short in the wires between the millimeter wave radar and multipurpose camera unit of the ACC CAN line (ACC CAN-L, ACC CAN-H).

   NO 

   Replace the Millimeter Wave Radar .