PSP Switch Signal Circuit Troubleshooting

Start the engine, and let it idle.
Align the steering wheel straight ahead.
Check the PSP SWITCH in the DATA LIST with the HDS.
Does it indicate ON?

YES -Go to step 4.

NO -Go to step 14 14.
Turn the steering wheel to its full lock position.
Check the PSP SWITCH in the DATA LIST with the HDS.
Does it change to OFF?

YES -The PSP switch signal circuit is OK.

NO -Go to step 6.
Turn the ignition switch to LOCK (0).
Disconnect the PSP switch 2P connector.
Start the engine.
Check the PSP SWITCH in the DATA LIST with the HDS.
Does it change to OFF?

YES -Replace the PSP switch.

NO -Go to step 10.
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect PCM connector A (49P).
Check for continuity between PSP switch 2P connector terminal No. 1 and body ground.

Fig 1: Checking Continuity Between PSP Switch 2P Connector Terminal No. 1 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Repair a short in the wire between the PCM (A38) and the PSP switch.

NO -Update the PCM if it does not have the latest software (see PCM UPDATE ), or substitute a known-good PCM (see SUBSTITUTING THE PCM ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see PCM REPLACEMENT ).
Turn the ignition switch to LOCK (0).
Disconnect the PSP switch 2P connector.
Connect PSP switch 2P connector terminals No. 1 and No. 2 with a jumper wire, then turn the ignition switch to ON (II).

Fig 2: Connecting PSP Switch 2P Connector Terminals No. 1 And No. 2 With Jumper Wire
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Check the PSP SWITCH in the DATA LIST with the HDS.
Does it change to ON?

YES -Replace the PSP switch.

NO -Go to step 18.
Turn the ignition switch to LOCK (0).
Remove the jumper wire from the PSP switch 2P connector.
Jump the SCS line with the HDS.
Disconnect PCM connector A (49P).
Connect PSP switch 2P connector terminal No. 1 to body ground with a jumper wire.

Fig 3: Connecting PSP Switch 2P Connector Terminal No. 1 To Body Ground With Jumper Wire
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Check for continuity between body ground and PCM connector terminal A38.

Fig 4: Checking Continuity Between Body Ground And PCM Connector Terminal A38
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Go to step 24.

NO -Repair an open in the wire between the PSP switch and the PCM (A38).
Check for continuity between PSP switch 2P connector terminal No. 2 and body ground.

Fig 5: Checking Continuity Between PSP Switch 2P Connector Terminal No. 2 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Update the PCM if it does not have the latest software (see PCM UPDATE ), or substitute a known-good PCM (see SUBSTITUTING THE PCM ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see PCM REPLACEMENT ).

NO -Repair an open in the wire between the PSP switch and G401.