Pinpoint Test E: The Individual Component Illumination Is Inoperative

Refer to appropriate SYSTEM WIRING DIAGRAM article for Cluster and Panel Illumination schematic and connector information.

Normal Operation 

The smart junction box (SJB) sends a pulse-width modulated (PWM) voltage to the dimmable components through circuit VLN04 (VT/GY) (Edge) or circuit VLN37 (BU/WH) (MKX). Ground is provided through circuits GD116 (BK/VT), GD126 (BK/WH) and GD139 (BK/YE).

This pinpoint test is intended to diagnose the following: 

• Wiring, terminals or connectors
• Floor shifter
• LH rear heated seat switch (if equipped)
• RH rear heated seat switch (if equipped)
• Manual temperature control (if equipped)
• Message center switch (if equipped)
• Memory set switch (MKX)
• Window adjust switches (MKX)
• Door lock control switches
• Headlamp switch
• Hazard/passenger air bag disable/traction control switch (if equipped)
• Power liftgate release switch
• Roof opening panel switch (if equipped)

PINPOINT TEST E: THE INDIVIDUAL COMPONENT ILLUMINATION IS INOPERATIVE 

1. E1 CHECK THE VOLTAGE TO THE SINGLE ILLUMINATION SOURCE 
   • Key in OFF position.
   • Disconnect: Inoperative Illumination Source
   • Key in ON position.
   • With the parking lamps on, rotate the instrument panel dimmer switch to the full illumination position.
   • Measure the voltage between the inoperative illumination source, harness side and ground as follows:
     EDGE
     
     

     Component	Connector-Pin	Circuit
     Floor shifter	C3245-3	VLN04 (VT/GY)
     Manual climate control	C2357a-4	VLN04 (VT/GY)
     Headlamp switch	C205-5	VLN04 (VT/GY)
     Message center switch	C253-1	VLN04 (VT/GY)
     Hazard/passenger air bag disable/traction control switch	C2355-6	VLN04 (VT/GY)
     LH door lock control switch	C505-2	CBP41 (BU)
     RH door lock control switch	C605-2	CBP41 (BU)
     Power liftgate release switch	C2269-3	VLN04 (VT/GY)

     MKX
     
     

     Component	Connector-Pin	Circuit
     Floor shifter	C3245-3	VLN37 (BU/WH)
     Memory set switch	C503-3	VLN37 (BU/WH)
     Headlamp switch	C205-5	VLN37 (BU/WH)
     Message center switch	C253-1	VLN37 (BU/WH)
     Hazard/passenger air bag disable/traction control switch	C2355-6	VLN37 (BU/WH)
     Power liftgate release switch	C2269-3	VLN37 (BU/WH)
     Roof opening panel switch	C912-2	VLN37 (BU/WH)
     LH front window control switch	C535a-6	VLN37 (BU/WH)
     RH front window control switch	C648-1	VLN37 (BU/WH)
     LH rear window control switch	C701-4	VLN37 (BU/WH)
     RH rear window control switch	C801-4	VLN37 (BU/WH)
     LH door lock control switch	C505-2	VLN37 (BU/WH)
     RH door lock control switch	C605-2	VLN37 (BU/WH)
     LH rear heated seat switch	C722-5	VLN37 (BU/WH)
     RH rear heated seat switch	C822-5	VLN37 (BU/WH)

   • Is the voltage greater than 10 volts? 
   1. YES  : For LH or RH rear window switches, INSTALL a new switch for the switch in question. REFER to GLASS, FRAMES AND MECHANISMS article.

      For all other components, go to  E2.

   2. NO  : REPAIR the circuit in question. TEST the system for normal operation.
2. E2 CHECK ILLUMINATION SOURCE GROUND CIRCUIT FOR AN OPEN 
   • Key in OFF position.
   • Measure the resistance between the inoperative illumination source, harness side and ground as follows:
     EDGE
     
     

     Component	Connector-Pin	Circuit
     Floor shifter	C3245-4	GD140 (BK/GN)
     Manual climate control	C2357a-23	GD115 (BK/GY)
     Headlamp switch	C205-10	GD116 (BK/VT)
     Message center switch	C253-4	GD116 (BK/VT)
     Hazard/passenger air bag disable/traction control switch	C2355-1	GD116 (BK/VT)
     LH door lock control switch	C505-4	GD133 (BK)
     RH door lock control switch	C605-4	GD140 (BK/GN)
     Power liftgate release switch	C2269-2	GD116 (BK/VT)

     MKX
     
     

     Component	Connector-Pin	Circuit
     Floor shifter	C3245-4	GD140 (BK/GN)
     Memory set switch	C503-7	GD133 (BK)
     Headlamp switch	C205-10	GD116 (BK/VT)
     Message center switch	C253-4	GD116 (BK/VT)
     Hazard/pad/traction control switch	C2355-1	GD116 (BK/VT)
     Power liftgate release switch	C2269-2	GD116 (BK/VT)
     Roof opening panel switch	C912-1	GD133 (BK)
     LH front window control switch	C535b-6	GD133 (BK)
     RH front window control switch	C648-6	GD140 (BK/GN)
     LH door lock control switch	C505- 4	GD133 (BK)
     RH door lock control switch	C605-4	GD140 (BK/GN)
     LH rear heated seat switch	C722-1	GD126 (BK/WH)
     RH rear heated seat switch	C822-1	GD145 (BK/BU)

   • Is the resistance less than 5 ohms? 
   1. YES  : INSTALL a new component in question. TEST the system for normal operation.
   2. NO  : REPAIR the circuit. TEST the system for normal operation.