Diagnostic System Check - Entertainment
Always perform the Diagnostic System Check - Entertainment before proceeding
with these diagnostic procedures. Refer to
Diagnostic System Check - Entertainment System
in Entertainment.
Schematic Reference:
Video System Schematics
Auxiliary Video Display is Poor or Blank
Important: The following information lists the most probable cause of the concern to the
least probable cause, followed by the appropriate test for the condition. If the list
leads to the replacement of a component, always inspect for a poor connection before
proceeding with the replacement. Refer to
Testing for Intermittent Conditions and Poor Connections
and
Connector Repairs
in Wiring Systems.
| • | Auxiliary Detect Signal circuit open, shorted to ground, or shorted to
battery positive. |
| | Test Auxiliary Detect signal circuit for resistance to ground with key in off
position. With no auxiliary device connected to red RCA input jack, resistance to
ground should be 270k ohms. With auxiliary device connected to red RCA input
jack, resistance to ground should be 50k ohms. If resistance values are not
correct, check for open, short to battery positive, or short to ground on auxiliary
detect signal circuit. Refer to
Circuit Testing
and
Wiring Repairs
in Wiring Systems. |
| • | Auxiliary Control Signal circuit open or shorted to battery positive. |
| | Test the Auxiliary Control circuit from the radio for an open or a short to
battery positive. Refer to
Circuit Testing
and
Wiring Repairs
in Wiring Systems. |
| • | Overhead console faulty. |
| | Test Auxiliary Detect signal circuit for resistance to ground with key in off
position. With no auxiliary device connected to red RCA input jack, resistance to
ground should be 270k ohms. With auxiliary device connected to red RCA input
jack, resistance to ground should be 50k ohms. If resistance values are not
correct, check for open, short to battery positive, or short to ground on auxiliary
detect signal circuit. Replace overhead console. |
