Steering Wheel Audio Control Switch Does Not Operate

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 steering wheel audio control switch connector.
3. Check resistance 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 (1): STEERING WHEEL AUDIO CONTROL SWITCH CIRCUIT

Disconnect TEL adapter unit connector.

Check continuity between TEL adapter unit harness connector (A) B140 and combination switch (spiral cable) harness connector (B) M23.

CONTINUITY SPECIFICATIONS

Terminals				Continuity
Connector	Terminal	Connector	Terminal	Continuity
B140	12	M23	24	Yes
	13		32
	14		31

Fig 1: Identifying Continuity Between Tel Adapter Unit Harness Connector B140 And Combination Switch

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

OK or NG

OK: GO TO 3.

NG: Repair harness or connector.

CHECK (2): STEERING WHEEL AUDIO CONTROL SWITCH CIRCUIT

Disconnect audio unit connector.

Check continuity between TEL adapter unit harness connector (A) B140 and audio unit harness connector (B) M39.

CONTINUITY SPECIFICATIONS

Terminals				Continuity
Connector	Terminal	Connector	Terminal	Continuity
B140	17	M39	22	Yes
	18		23
	19		25

Fig 2: Identifying Continuity Between Tel Adapter Unit Harness Connector B140 And Audio Unit Harness Connector

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

OK or NG

OK: GO TO 4.

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 terminals 22, 23 and ground.
  22 - Ground: Approx. 5 V
  
  23 - Ground: Approx. 5 V
  
  Fig 3: Identifying Voltage Between Audio Unit Harness Connector M39 Terminals 22, 23 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG

OK: GO TO 5.

NG: Replace audio unit.
CHECK TEL ADAPTER UNIT
1. Connect TEL adapter unit connector.
2. Turn ignition switch ON.
3. Check voltage between TEL adapter unit harness connector B140 terminals 12, 13 and ground.
  12 - Ground: Approx. 5 V
  
  13 - Ground: Approx. 5 V
  
  Fig 4: Identifying Voltage Between Tel Adapter Unit Harness Connector B140 Terminals 12, 13 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG

OK: Replace steering wheel audio control switch.

NG: Replace TEL adapter unit.