Diagnosis Procedure

WARNING: This page is about a different car, the 2011 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.

CHECK CONTINUITY IMAGE SWITCH SIGNAL CIRCUIT

Turn ignition switch OFF.
Disconnect headrest display unit connector and video distributor connector.

Check continuity between headrest display unit harness connector and video distributor harness connector.

CONTINUITY SPECIFICATION

Headrest display unit

Video distributor

Continuity

Connector

Terminal

Connector

Terminal

B554⁽¹⁾

M217

Existed

B574⁽²⁾

Existed

⁽¹⁾	Headrest display unit LH

⁽²⁾	Headrest display unit RH

Check continuity between headrest display unit harness connector and ground.

CONTINUITY SPECIFICATION

Headrest display unit

Ground

Continuity

Connector

Terminal

B554⁽¹⁾

Not existed

B574⁽²⁾

⁽¹⁾	Headrest display unit LH

⁽²⁾	Headrest display unit RH

Is the inspection result normal?

YES: Go to 2.

NO: Repair harness or connector.

CHECK VIDEO DISTRIBUTOR VOLTAGE

Connect headrest display unit connector and video distributor connector.
Turn ignition switch ON.

Check voltage between video distributor harness connector and ground.

VOLTAGE SPECIFICATION

(+)		(-)	Condition	Voltage (Approx.)
Video distributor
Connector	Terminal
M217	9	Ground	When DVD, USB or front AUX image is displayed on headrest display unit RH.	0.5 V
	9		When rear AUX image is displayed on headrest display unit RH.	4.5 V
	10		When DVD, USB or front AUX image is displayed on headrest display unit LH.	0.5 V
	10		When rear AUX image is displayed on headrest display unit LH.	4.5 V

Is the inspection result normal?

YES: Replace video distributor. Refer to "REMOVAL AND INSTALLATION ".

NO: Replace headrest display unit LH (RH). Refer to "EXPLODED VIEW ".