Nissan Maxima Service and Repair Manual: B261A push-button ignition switch

Description

IPDM E/R transmits the push-button ignition switch status via CAN communication to BCM. BCM receives push-button ignition switch status by hardwire input. BCM compares the 2 signals for mismatch.

DTC Logic

DTC DETECTION LOGIC

NOTE:

• If DTC B261A is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to PCS-44, "DTC Logic".
• If DTC B261A is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to PCS-45, "DTC Logic".

DTC CONFIRMATION PROCEDURE

1.PERFORM DTC CONFIRMATION PROCEDURE

1. Press the push-button ignition switch under the following conditions and wait for at least 1 second.

• CVT selector lever is in the P position
• Do not depress brake pedal.

2. Check "Self diagnostic result" with CONSULT.

Diagnosis Procedure

1. CHECK PUSH-BUTTON IGNITION SWITCH OPERATION

Press push-button ignition switch and check if it turns to ON.

2. CHECK IGNITION SWITCH OUTPUT SIGNAL (IPDM E/R)

1. Turn ignition switch OFF.
2. Disconnect push-button ignition switch.
3. Check voltage between IPDM E/R harness connector and ground.

3. CHECK PUSH-BUTTON IGNITION SWITCH CIRCUIT (IPDM E/R)

1. Disconnect IPDM E/R and BCM.
2. Check continuity between IPDM E/R harness connector (A) and push-button ignition switch harness connector (B).
3. Check continuity between IPDM E/R harness connector and ground.

4. CHECK IGNITION SWITCH OUTPUT SIGNAL (BCM)

1. Disconnect push-button ignition switch.
2. Check voltage between BCM harness connector and ground.

5. CHECK PUSH-BUTTON IGNITION SWITCH CIRCUIT (BCM)

1. Disconnect BCM and IPDM E/R.
2. Check continuity between BCM harness connector and push-button ignition switch harness connector.
3. Check continuity between BCM harness connector and ground.