Cannot select ON mode with keyless access and with the keyless remote touching the engine start/stop switch (2018 2019 2020)

-1. Do this procedure 10 times: Turn the vehicle to the ON mode.

Does the system change to ON mode?

YES 

Intermittent failure, the system is OK at this time. Check for loose or poor connection.

NO 

Go to step 2.

-1. Touch the engine start/stop switch with the keyless remote. The buttons on the keyless remote should be facing you.

-2. Turn the vehicle to the ON mode.

Does the system change to ON mode?

YES 

Go to keyless access system symptom troubleshooting "Cannot select ON mode with keyless access, but can select ON mode with the keyless remote touching the engine start/stop switch" .

NO 

Go to step 3.

-1. Select KEYLESS ACCESS CONTROL UNIT from the ONE-PUSH START system select menu with the HDS, and enter SELF CHECK.

One-Push - KEYLESS ACCESS CONTROL UNIT - SELF CHECK

Does the system communicate with the HDS?

YES 

Go to step 4.

NO 

Go to step 10.

-1. Reboot the HDS.

-2. Select model on the HDS screen.

-3. When prompted by the HDS, select YES when asked if the vehicle has keyless access system, then press and hold the engine start/stop button for at least 2 minutes. This selects the forced ON mode.

Does the system change to forced ON mode?

YES 

Go to step 5.

NO 

Go to step 15.

-1. Check for PCU DTCs with the HDS.

Are any DTCs indicated?

YES 

Troubleshoot the PCU DTCs.

NO 

Go to step 6.

-1. Check for keyless access/TPMS control unit DTCs with the HDS.

Are any DTCs indicated?

YES 

Troubleshoot the keyless access/TPMS control unit DTCs.

NO 

Go to step 7.

-1. Check for backup control unit DTCs with the HDS.

Are any DTCs indicated?

YES 

Troubleshoot the backup control unit DTCs.

NO 

Go to step 8.

-1. Do the keyless access remote check using the all keyless remotes .

Are the all keyless remotes OK?

YES 

Go to step 9.

NO 

Replace the keyless remote and recheck.

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

-2. Remove all the keyless remotes from inside the vehicle. Place the keyless remotes more than 4.9 ft (1.5 m) away from the vehicle.

-3. When prompted by the HDS, select YES when asked if the vehicle has keyless access system, then press and hold the engine start/stop button for at least 2 minutes. This selects the forced ON mode.

-4. Do the registration of the keyless access/TPMS control unit according to the instructions on the HDS screen.

-5. Select REGISTRATION from the ONE-PUSH START system select menu with the HDS, then select REPLACE PCU/BACKUP CONTROL/KEYLESS ACCESS CONTROL UNIT.

-6. Take the keyless remote into the vehicle, and clear the PCU DTCs with the HDS.

-7. Do this procedure 10 times: Turn the vehicle to the ON mode.

Does the system change to ON mode?

YES 

Intermittent failure, the system is OK at this time. Check for loose or poor connection.

NO 

Replace the original keyless access/TPMS control unit .

-1. Do the DLC circuit troubleshooting .

Is L-line OK?

YES 

Go to step 11.

NO 

Repair an L-line wire circuit.

-1. Do the engine start/stop switch test .

Is the engine start/stop switch OK?

YES 

Go to step 12.

NO 

Replace the engine start/stop switch .

-1. Disconnect the following connectors.

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

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

Is there continuity?

YES 

The SS1 (+) and SS2 (-) wires are OK. Go to step 13.

NO 

Repair an open or high resistance in the wire.

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

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

Is there battery voltage?

YES 

The +B SMART wire is OK. Go to step 14.

NO 

Repair an open or high resistance in the wire. If wire is OK, check the No. D30 fuse circuit.

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

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

Is there continuity?

YES 

The LG wire is OK. Go to step 15.

NO 

Repair an open or high resistance in the wire.

-1. Check for PCU DTCs with the HDS.

Are any DTCs indicated?

YES 

Troubleshoot the PCU DTCs.

NO 

Go to step 16.

-1. Disconnect the following connector.

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

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

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

Is there battery voltage?

YES 

The +B SMART and +B BACK UP wires are OK. Go to step 17.

NO 

Repair an open or high resistance in the wire.

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

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

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

Is there continuity?

YES 

Replace the original keyless access/TPMS control unit .

NO 

Repair an open or high resistance in the ground wire or poor ground (G502).