DTC : B18C7, B1E77

DTC B18C7  : Open in the Left Side BSI Radar Unit Indicator Circuit

DTC B1E77  : Open in the Right Side BSI Radar Unit Indicator Circuit

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

How to Troubleshoot the Blind Spot Information System/Cross Traffic Monitor (2016 2017 2018)  or

How to Troubleshoot the Blind Spot Information System/Cross Traffic Monitor (2019 2020 2021) .

DTC (BSI)

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.

   - 4. Turn the vehicle to the ON mode, then wait for at least 2 seconds.

   - 5. Check for DTCs with the HDS.

   DTC Description	DTC
   B18C7 Open in the Left Side BSI Radar Unit Indicator Circuit
   B1E77 Open in the Right Side BSI Radar Unit Indicator Circuit

   Is DTC B18C7 or B1E77 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 Blind Spot Information System/Cross Traffic Monitor (2016 2017 2018)  or

   How to Troubleshoot the Blind Spot Information System/Cross Traffic Monitor (2019 2020 2021) .

2. BSI alert indicator check

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

   - 2. Disconnect the following connector.

   BSI alert indicator 2P connector

   - 3. Connect terminals 1 and 2 with a jumper wire.

   Test condition	Vehicle OFF mode
   	BSI radar unit 6P connector: disconnected
   	BSI alert indicator 2P connector: disconnected
   Test point 1	BSI alert indicator 2P connector No. 1
   Test point 2	BSI alert indicator 2P connector No. 2

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

   - 4. Turn the vehicle to the ON mode.

   - 5. Check for DTCs with the HDS.

   DTC Description	DTC
   B18C7 Open in the Left Side BSI Radar Unit Indicator Circuit
   B1E77 Open in the Right Side BSI Radar Unit Indicator Circuit
   B18C5 Short to GND in the Left Side BSI Radar Unit Indicator Circuit
   B1E75 Short to GND in the Right Side BSI Radar Unit Indicator Circuit

   Is DTC B18C7 change to DTC B18C5, or DTC B1E77 change to B1E75?

   YES 

   Replace the appropriate BSI Alert Indicator - Removal and Installation .

   NO 

   Go to step 3.

3. Open wire check (DR BSD IND+, AS BSI IND+ lines)

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

   - 2. Remove the jumper wire from the BSI alert indicator 2P connector.

   - 3. Disconnect the following connector.

   BSI radar unit 6P connector

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

   Test condition	Vehicle OFF mode
   	BSI radar unit 6P connector: disconnected
   	BSI alert indicator 2P connector: disconnected
   Test point 1	BSI radar unit 6P connector No. 2
   Test point 2	BSI alert indicator 2P connector No. 2

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

   Is there continuity?

   YES 

   The DR BSD IND+, AS BSI IND+ wires are OK. Go to step 4.

   NO 

   Repair an open in the wire between the BSI radar unit and the BSI alert indicator.

4. Open wire check (PGND, GND line)

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

   Test condition	OFF mode
   	BSI radar unit 6P connector: disconnected
   	BSI alert indicator 2P connector: disconnected
   Test point 1	BSI alert indicator 2P connector No. 1
   Test point 2	Body ground

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

   Is there continuity?

   YES 

   Replace the appropriate BSI Radar Unit - Removal and Installation .

   NO 

   Repair an open in the wire between the BSI alert indicator and the body ground at G401 (left BSI alert indicator), G405 (right BSI alert indicator).