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Home >> Cadillac >> 2006 >> STS Base, 3.6 7, RWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays, Gauges And Console >> Diagnostic Information and Procedures >> Head Up Display (HUD) Inoperative >> HUD Inoperative

HUD Inoperative

HUD Diagnostic System Check assumes the technician checked that the HUD battery voltage circuit is good.

Head Up Display (HUD) Inoperative

Step Action Yes No
Schematic Reference:  Head Up Display Schematics   or  Instrument Cluster Schematics  
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2
  1. Disconnect the head up display (HUD) Switch.
  2. Turn the ignition ON with the engine OFF.
  3. Connect a DMM between the HUD image dimming signal circuit and a good ground.
Does the DMM display at or near 5 volts?		 Go to Step 3  Go to Step 5 
3 Connect a DMM between the HUD switch low reference circuit and battery voltage.
Does the DMM display at or near current battery voltage?		 Go to Step 4  Go to Step 6 
4
  1. Connect a DMM between the HUD image dimming signal circuit and the HUD switch low reference circuit.
  2. Measure the resistance while varying the dimming intensity with the dimming switch.
  3. Observe the displays on the DMM.
Does the resistance change smoothly between 2k-10k?		 Go to Step 8  Go to Step 7 
5 Test the HUD image dimming signal circuit for an open, for a high resistance, or for a short to ground. Refer to Circuit Testing andWiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 9  Go to Step 8 
6 Test the HUD switch low reference circuit for an open or for a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 9  Go to Step 8 
7 Replace the HUD Switch. Refer to Head Up Display Switch Replacement .
Did you complete the replacement?		 Go to Step 9  -
8 Replace the HUD. Refer Control Module References in Computer/Integrating Systems for replacement, setup, and programming.
Did you complete the replacement?		 Go to Step 9  -
9 Operate the system in order to verify the repair.
Did you correct the condition?		 Go to Step 2  System OK
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