Gauge Control Module Input Test

1.Remove the Gauge Control Module.

2.Disconnect the 30P connector from the Gauge Control Module.

3.Inspect the connector and socket terminals to be sure they are all making good contact.

  • If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.
  • If the terminals look OK, go to 4.

4.With the connector still disconnected, make these input tests at the connector.

  • If any test indicates a problem, find and correct the cause, then recheck the system.
  • If all the input tests prove OK, replace the gauge control module.

Cavity Wire Test Condition Test: Desired result Possible cause if result is not obtained 
5 YEL Ignition switch ON (II) Check for voltage to ground:
There should be battery voltage 
  • Blown No. 21 (7.5A) fuse in the under-dash fuse/relay box
  • An open in the wire
 
6 WHT Under all conditions Check for voltage to ground:
There should be battery voltage 
  • Blown No. 7 (10A) fuse in the under-dash fuse/relay box
  • An open in the wire
 
21 BLK Under all conditions Check for continuity to ground:
There should be continuity. 
  • Poor ground (G503)
  • An open in the wire
 
25 WHT Under all conditions Check for coninuity between the No. 25 terminal and under-dash fuse/relay box N (45P) connector No. 28 terminal:
There should be coninuity 
  • An open in the wire
 
Under-dash fuse/relay box connector N (45P) disconnected Check coninuity to ground:
There should be no continuity 
  • Short to ground on the wire