Without Telephone System

WARNING: This page is about a different car, the 2006 Infiniti G35. However, it is still accessible from the selected car via links, so may be relevant.

CHECK STEERING WHEEL AUDIO CONTROL SWITCH RESISTANCE
1. Turn ignition switch OFF.
2. Disconnect of steering wheel audio control switch connector.
3. Check resistance of steering wheel audio control switch. Refer to "STEERING WHEEL AUDIO CONTROL SWITCH RESISTANCE INSPECTION ".
  Resistance value is OK?
YES or NO

YES: GO TO 2.

NO: Replace steering wheel audio control switch.

CHECK STEERING WHEEL AUDIO CONTROL SWITCH CIRCUIT

Disconnect audio unit connector.

Check continuity between audio unit harness connector M39 and combination switch (spiral cable) harness connector M23.

CONTINUITY SPECIFICATIONS

Terminals				Continuity
Connector	Terminal	Connector	Terminal	Continuity
M39	22	M23	24	Yes
	23		32
	25		31

Fig 1: Identifying Continuity Between Audio Unit Harness Connector M39 And Combination Switch Harness Connector

Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: GO TO 3.

NG: Repair harness or connector.

CHECK AUDIO UNIT
1. Connect audio unit connector.
2. Turn ignition switch ON.
3. Check voltage between audio unit harness connector M39 terminal 22, 23 and ground.
  22 - Ground: Approx. 5 V
  
  23 - Ground: Approx. 5 V
  
  Fig 2: Identifying Voltage Between Audio Unit Harness Connector M39 Terminal 22, 23 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG

OK: Replace combination switch (spiral cable).

NG: Replace audio unit.