GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2008 🢒 Escalade - 2WD 🢒 Driver Information and Entertainment 🢒 Cellular, Entertainment, and Navigation 🢒 Dual DVD Rear Seat Entertainment Headrest Display Malfunction

Diagnostic Instructions
    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    •  Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

DVD Control Module B+

--

1

--

--

Left Display B+

2

2

2

--

Right Display B+

3

3

3

--

Left Audio Signal (+)

4

5

4

--

Right Audio Signal (+)

6

7

6

--

Left DVD Video Signal (+)

8

8

8

--

Right DVD Video Signal (+)

9

9

9

--

Left Display Video Ground

8

8

8

--

Right Display Video Ground

9

9

9

--

Left Display Ground

--

2

2

--

Right Display Ground

--

3

3

--

DVD Control Module Ground

--

1

--

--

1. DVD Control Module inoperative, both displays inoperative.

2. Left display inoperative.

3. Right display inoperative.

4. Left audio distorted.

5. No sound from left audio.

6. Right audio distorted.

7. No sound from right audio.

8. Left display blank.

9. Right display blank.

Circuit Description

The DVD displays are grounded and powered by the DVD control module. When a movie is playing, the video signals are sent from the player, to the DVD control module, and back to the display. This allows the other monitor to source the same video as the player with the disc.

Reference Information

Schematic Reference

Video System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Video Entertainment System Description and Operation

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

One Display Inoperative

  1. Ignition OFF, disconnect the X1 harness connector at the appropriate display.
  2. Ignition ON, test for less than 5 Ω between the ground circuit terminal 5 and ground.
    3. ⇒If greater than the specified range, test the ground circuit for an open/high resistance. If the circuit tests normal, replace the DVD control module.
  3. Ignition ON, test for B+ between the ignition voltage circuit terminal 6 and ground.
    4. ⇒If less than the specified value, B+ circuit for an open/high resistance. If the circuit tests normal, replace the DVD control module.
  4. Ignition OFF, reconnect the X1 harness connector, and disconnect the X2 harness connector at the display.
  5. Ignition ON, test for 4.5-5.5 V between the terminals listed below and ground:
    6. • I2C Clock Signal -- terminal 5
    • I2C Data -- terminal 6
    ⇒If less than specified range, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the DVD control module.
    ⇒If greater than specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the DVD control module.
  6. If all circuits test normal, replace the appropriate display.

Both Displays Inoperative

  1. Ignition OFF, disconnect the X1 harness connector at the DVD control module.
  2. Test for less 5 Ω between the ground circuit terminal 3 and ground.
    3. ⇒If the greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, test for B+ between the accessory voltage circuit terminal and ground.
    4. ⇒If less than the specified value, test the B+ circuit for a short to ground or an open/high resistance.
  4. Ignition OFF, Reconnect the X1 harness connector at the DVD control module
  5. Disconnect the X1 harness connector at the driver seat headrest.
  6. Ignition ON, test for less than 5 Ω between the ground circuit terminal 5 and ground.
    7. ⇒If greater than the specified range, test the ground circuit for an open/high resistance. If the circuit tests normal, replace the DVD control module.
  7. Ignition ON, test for B+ between the ignition voltage circuit terminal 6 and ground.
    8. ⇒If less than the specified value, B+ circuit for an open/high resistance. If the circuit tests normal, replace the DVD control module.
  8. Ignition OFF, reconnect the X1 harness connector, and disconnect the X2 harness connector at the display.
  9. Ignition ON, test for 4.5-5.5 V between the terminals listed below and ground:
    10. • I2C Clock Signal -- terminal 5
    • I2C Data -- terminal 6
    ⇒If less than specified range, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the DVD control module.
    ⇒If greater than specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the DVD control module.
  10. If all circuits test normal, replace the appropriate display.