Diagnosis Procedure

WARNING: This page is about a different car, the 2020 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.

INSPECTION START
Perform inspection in accordance with procedure that confirms malfunction.

Which procedure confirms malfunction?

Component Function Check 1

GO TO 2.

Component Function Check 2

GO TO 4.
CHECK HORN FUNCTION
Check that horns function properly using horn switch.

Do horns sound?

YES

GO TO 3.

NO

Check horn circuit. Refer to appropriate wiring information .

CHECK HORN CONTROL CIRCUIT

Disconnect horn relay.
Disconnect IPDM E/R connector.

Check continuity between IPDM E/R harness connector and horn relay harness connector.

IPDM E/R		Horn relay		Continuity
Connector	Terminal	Connector	Terminal	Continuity
E119	23	H-1	1	Yes

Check continuity between IPDM E/R harness connector and ground.

IPDM E/R		Ground	Continuity
Connector	Terminal
E119	23		No

Is the inspection result normal?

YES

Replace IPDM E/R. Refer to Removal and Installation .

Repair or replace harness.

CHECK ANTI-THEFT HORN RELAY POWER SUPPLY

Disconnect anti-theft horn relay.

Check voltage between anti-theft horn relay harness connector and ground.

(+)		(-)	Voltage (V)
Anti-theft horn relay
Connector	Terminal
E8	2	Ground	Battery voltage

Is the inspection result normal?

YES

GO TO 5.

Check 10 A fuse [No. 57 located in the fuse and fusible link box].

Check harness for open or short between anti-theft horn relay and fuse.

CHECK ANTI THEFT HORN CONTROL CIRCUIT

Disconnect IPDM E/R connector.

Check continuity between IPDM E/R harness connector and anti-theft horn relay harness connector.

IPDM E/R		Anti theft horn relay		Continuity
Connector	Terminal	Connector	Terminal	Continuity
E119	22	E8	1	Yes

Check continuity between IPDM E/R harness connector and ground.

IPDM E/R		Ground	Continuity
Connector	Terminal
E119	22		No

Is the inspection result normal?

YES

GO TO 6.

Repair or replace harness.

CHECK ANTI-THEFT HORN CIRCUIT

Check continuity between anti-theft horn relay harness connector and anti-theft horn harness connector.

Anti-theft horn relay		Anti-theft horn		Continuity
Connector	Terminal	Connector	Terminal	Continuity
E8	3	E231	1	Yes

Check continuity between anti-theft horn relay harness connector and ground.

Anti-theft horn relay		Ground	Continuity
Connector	Terminal
E8	3		No

Is the inspection result normal?

YES

GO TO 7.

Repair or replace harness.

CHECK ANTI-THEFT HORN RELAY
Refer to Component Inspection .

Is the inspection result normal?

YES

Replace anti-theft horn.

NO

Replace anti-theft horn relay.