Nissan Maxima Service and Repair Manual: Horn
Horn (high/low) is located inside of front bumper and operates when theft warning system is in alarm phase.
Component Function Check
Select HORN in "ACTIVE TEST" mode with CONSULT.
Check the horn (high/low) operation.
Regarding Wiring Diagram information, refer to SEC-136, "Wiring Diagram".
1.CHECK HORN FUNCTION
Check horn function with horn switch
2.CHECK HORN RELAY POWER SUPPLY
Turn ignition switch ON.
Perform "ACTIVE TEST" ("HORN") with CONSULT.
Using an analog voltmeter or an oscilloscope, check voltage between IPDM E/R harness connector E17 terminal 44 and ground.
3.CHECK HORN RELAY CIRCUIT
Turn ignition switch OFF.
Disconnect IPDM E/R and horn relay connector.
Check continuity between IPDM E/R harness connector E17 (A) terminal 44 and horn relay harness connector H1 (B) terminal 1.
4. Check continuity between IPDM E/R harness connector E17 (A) terminal 44 and ground.
4.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".