Diagnosis Procedure

WARNING: This page is about a different car, the 2018 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

CHECK HORN FUNCTION
Check horn function with horn switch.

Do horns sound?

YES

GO TO 2.

NO

Perform the trouble diagnosis for horn circuit. Refer to the Wiring Diagram graphic below.

Courtesy of NISSAN NORTH AMERICA, INC.

CHECK IPDM E/R POWER SUPPLY CIRCUIT

Disconnect horn relay connector.
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
E19	22	H-1	1	Yes

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

IPDM E/R		Ground	Continuity
Connector	Terminal
E19	22		No

Is the inspection result normal?

YES

GO TO 3.

Repair or replace harness.

CHECK INTERMITTENT INCIDENT
Refer to Intermittent Incident .

Inspection End.