B2553

B2553 IGNITION RELAY





Description
BCM turns ON the following relays to ignition power supply to each ECU when the ignition switch is turned
ON.
- Ignition relay (located in fuse block)
- Ignition relay (built into IPDM E/R)
- Blower relay
BCM checks any ignition relay ON request for consistency with the actual ignition relay operation status.




DTC Logic

DTC DETECTION LOGIC

DTC Detection Logic:

DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON under the following conditions (start the engine), and wait for at least 2 seconds.
- Selector lever is in the P or N position.
- Do not depress brake pedal.
2. Check "Self diagnostic result" with CONSULT-III.
Is DTC detected?
YES - Go to B2553.
NO - INSPECTION END




Diagnosis Procedure
1.CHECK DTC WITH IPDM E/R
Check "Self diagnostic result" with CONSULT-III. Refer to Testing and Inspection.
Is the inspection result normal?
YES - GO TO 2.
NO - Repair or replace malfunctioning parts.
2.CHECK FUSE
Check that the following fuse is not blown.





Is the fuse blown?
YES - Replace the blown fuse after repairing the affected circuit if a fuse is blown.
NO - GO TO 3.
3.CHECK IGNITION RELAY FEEDBACK INPUT
1. Turn ignition switch OFF.
2. Disconnect BCM connector.
3. Check voltage between BCM harness connector and ground.





Is the inspection result normal?
YES - GO TO 5.
NO - GO TO 4.
4.CHECK IGNITION RELAY FEEDBACK CIRCUIT
1. Disconnect IPDM E/R connector.
2. Check continuity between BCM harness connector and IPDM E/R harness connector.





3. Check continuity between BCM harness connector and ground.





Is the inspection result normal?
YES - Replace IPDM E/R. Refer to Removal and Installation.
NO - Repair or replace harness.
5.CHECK INTERMITTENT INCIDENT
Refer to Intermittent Incident.
- INSPECTION END