F-Can Circuit (R20A5) (2013 2014 2015)

-1. Press the engine start/stop button to select the OFF mode.

-2. Jump the SCS line with the HDS.

-3. Disconnect the following connector.

-4. Measure the resistance between test points 1 and 2.

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

Is there about 76-107 Ω?

YES 

Go to step 10

NO 

Go to step 2.

Disconnect the following connectors:

• Gauge control module 32P connector
• VSA modulator-control unit 22P connector
• Steering angle sensor 4P connector
• Audio-navigation unit connector H (28P) (with navigation)
• EPS control unit connector A (11P)
• ANC/Active sound control unit 20P connector (with ANC/Active sound control)
• Power control unit connector C (36P)
• SRS unit connector A (39P)
• TPMS control unit 36P connector (USA and Mexico models)
• AcuraLink control unit (XM receiver) connector A (32P) (USA models with navigation)

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

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

Is there continuity?

YES 

Repair a short in the F CAN-H wire to F CAN-L wire between PCM terminals A3 and A4.

NO 

The F CAN-H and F CAN-L wires are not shorted. Go to step 3.

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

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

Is there continuity?

YES 

The F CAN-H wire is not open between the PCM and the gauge control module. Go to step 4.

NO 

Repair an open in the F CAN-H wire between the PCM (A3) and the gauge control module.

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

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

Is there continuity?

YES 

The F CAN-H wire is not open between the PCM and the VSA modulator-control unit. Go to step 5.

NO 

Repair an open in the F CAN-H wire between the PCM (A3) and the VSA modulator-control unit.

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

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

Is there continuity?

YES 

The F CAN-H wire is not open between the PCM and the EPS control unit. Go to step 6.

NO 

Repair an open in the F CAN-H wire between the PCM (A3) and the EPS control unit.

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

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

Is there continuity?

YES 

The F CAN-L wire is not open between the PCM and the gauge control module. Go to step 7.

NO 

Repair an open in the F CAN-L wire between the PCM (A4) and the gauge control module.

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

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

Is there continuity?

YES 

The F CAN-L wire is not open between the PCM and the VSA modulator-control unit. Go to step 8.

NO 

Repair an open in the F CAN-L wire between the PCM (A4) and the VSA modulator-control unit.

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

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

Is there continuity?

YES 

The F CAN-L wire is not open between the PCM and the EPS control unit. Go to step 9.

NO 

Repair an open in the F CAN-L wire between the PCM (A4) and the EPS control unit.

-1. Reconnect VSA modulator-control unit 22P connector .

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

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

Is there about 108-132 Ω?

YES 

The VSA modulator-control unit is OK. Go to step 10.

NO 

Replace the original VSA modulator-control unit .

Disconnect the following connectors:

• Gauge control module 32P connector
• VSA modulator-control unit 22P connector
• Steering angle sensor 4P connector
• Audio-navigation unit connector H (28P) (with navigation)
• EPS control unit connector A (11P)
• ANC/Active sound control unit 20P connector (with ANC/Active sound control)
• Power control unit connector C (36P)
• SRS unit connector A (39P)
• TPMS control unit 36P connector (USA and Mexico models)
• AcuraLink control unit (XM receiver) connector A (32P) (USA models with navigation)

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

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

Is there continuity?

YES 

Repair a short in the F CAN-H wire between the PCM (A3) and the gauge control module, the VSA modulator-control unit, the steering angle sensor, the navigation unit (with navigation), the EPS control unit, the power control unit, the SRS unit, the TPMS control unit (USA and Mexico models), the AcuraLink control unit (XM receiver) (USA models with navigation), or the DLC.

NO 

The F CAN-H wire is OK. Go to step 11.

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

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

Is there continuity?

YES 

Repair a short in the F CAN-L wire between the PCM (A4) and the gauge control module, the VSA modulator-control unit, the steering angle sensor, the navigation unit (with navigation), the EPS control unit, the power control unit, the SRS unit, the TPMS control unit (USA and Mexico models), the AcuraLink control unit (XM receiver) (USA models with navigation), or the DLC.

NO 

The F CAN-L wire is OK. Go to step 12.

-1. Reconnect all connectors.

-2. Connect the HDS to the DLC.

-3. Disconnect the following connector.

-4. Press the engine start/stop button to select the ON mode, and read the HDS.

Does the HDS identify the vehicle?

YES 

Replace the gauge control module .

NO 

Go to step 13.

-1. Press the engine start/stop button to select the OFF mode.

-2. Reconnect the gauge control module 32P connector .

-3. Disconnect the following connector.

-4. Press the engine start/stop button to select the ON mode, and read the HDS.

Does the HDS identify the vehicle?

YES 

Replace the VSA modulator-control unit .

NO 

Go to step 14.

-1. Press the engine start/stop button to select the OFF mode.

-2. Reconnect the VSA modulator-control unit 22P connector .

-3. Disconnect the following connector.

-4. Press the engine start/stop button to select the ON mode, and read the HDS.

Does the HDS identify the vehicle?

YES 

Replace the steering angle sensor .

NO (with navigation) 

Go to step 15.

NO (without navigation) 

Go to step 16.

-1. Press the engine start/stop button to select the OFF mode.

-2. Reconnect the steering angle sensor 4P connector .

-3. Disconnect the following connector.

-4. Press the engine start/stop button to select the ON mode, and read the HDS.

Does the HDS identify the vehicle?

YES 

Replace the audio-navigation unit .

NO 

Go to step 16.

-1. Press the engine start/stop button to select the OFF mode.

-2. Reconnect the steering angle sensor 4P connector (without navigation) or the audio-navigation unit connector H (28P) (with navigation) .

-3. Disconnect the following connector.

-4. Press the engine start/stop button to select the ON mode, and read the HDS.

Does the HDS identify the vehicle?

YES 

Replace the EPS control unit .

NO 

Go to step 17.

-1. Press the engine start/stop button to select the OFF mode.

-2. Reconnect EPS control unit connector A (11P) .

-3. Disconnect the following connector.

-4. Press the engine start/stop button to select the ON mode, and read the HDS.

Does the HDS identify the vehicle?

YES 

Replace the power control unit .

NO 

Go to step 18.

-1. Press the engine start/stop button to select the OFF mode.

-2. Reconnect power control unit connector C (36P) .

-3. Disconnect the following connector.

-4. Press the engine start/stop button to select the ON mode, and read the HDS.

Does the HDS identify the vehicle?

YES 

Replace the SRS unit .

NO (USA and Mexico models) 

Go to step 19.

NO (Canada models) 

Update the PCM if it does not have the latest software, or substitute a known-good PCM , then recheck. If the HDS identifies the vehicle and the PCM was updated, troubleshooting is complete. If the HDS identifies the vehicle and the PCM was substituted, replace the original PCM .

-1. Press the engine start/stop button to select the OFF mode.

-2. Reconnect SRS unit connector A (39P) .

-3. Disconnect the following connector.

-4. Press the engine start/stop button to select the ON mode, and read the HDS.

Does the HDS identify the vehicle?

YES 

Replace the TPMS control unit .

NO (USA models with navigation) 

Go to step 20.

NO (except USA models with navigation) 

Update the PCM if it does not have the latest software, or substitute a known-good PCM , then recheck. If the HDS identifies the vehicle and the PCM was updated, troubleshooting is complete. If the HDS identifies the vehicle and the PCM was substituted, replace the original PCM .

-1. Press the engine start/stop button to select the OFF mode.

-2. Reconnect the TPMS control unit 36P connector .

-3. Disconnect the following connector.

-4. Press the engine start/stop button to select the ON mode, and read the HDS.

Does the HDS identify the vehicle?

YES 

Replace the AcuraLink control unit (XM receiver) .

NO 

Update the PCM if it does not have the latest software, or substitute a known-good PCM , then recheck. If the HDS identifies the vehicle and the PCM was updated, troubleshooting is complete. If the HDS identifies the vehicle and the PCM was substituted, replace the original PCM .