Nissan Altima 2007-2012 Service 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 SEC-36, "DTC Logic".

• If DTC B261A is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to SEC-37, "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-III.

Is DTC detected? YES >> Refer to SEC-108, "Diagnosis Procedure".

NO >> Inspection End.

Diagnosis Procedure

1.CHECK PUSH-BUTTON IGNITION SWITCH OUTPUT SIGNAL 1

1. Turn ignition switch OFF.

2. Disconnect push-button ignition switch harness connector and IPDM E/R harness connector.

3. Check voltage between push-button ignition switch harness connector and ground.

Is the inspection result normal? YES >> GO TO 4

NO >> GO TO 2

2.CHECK PUSH-BUTTON IGNITION SWITCH CIRCUIT

1. Disconnect BCM harness connector.

2. Check continuity between push-button ignition switch harness connector M38 (A) terminal 4 and BCM harness connector M19 (B) terminal 77.

3. Check continuity between push-button ignition switch harness connector M38 (A) terminal 4 and ground.

Is the inspection result normal? YES >> GO TO 3

NO >> Repair harness or connector.

3.CHECK PUSH-BUTTON IGNITION SWITCH

1. Disconnect IPDM E/R harness connector.

2. Check continuity between push-button ignition switch harness connector M38 (A) terminal 4 and IPDM E/R harness connector E18 (B) terminal 28.

3. Check continuity between push-button ignition switch harness connector and ground.

Is the inspection result normal? YES >> GO TO 4

NO >> Repair harness or connector.

4.CHECK INTERMITTENT INCIDENT

Refer to GI-42, "Intermittent Incident".

>> Inspection End.

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