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Speedometer/Odometer Inoperative - With Rear Anti-Lock Brakes

  1. Connect NGS tester to Data Link Connector (DLC). Monitor PID IGN_GEM while turning key to each position. If PID values agree with key positions, go to next step. If PID values do not agree with key positions, see STEERING COLUMN SWITCHES article.
  2. Retrieve continuous and on-demand DTCs. If DTC C1751 is present, go to step 9). If DTC C1752 is present, go to step 7). If DTC P0500 or no DTCs are present, go to next step.
  3. Disconnect Generic Electronic Module (GEM) connector C224. GEM 20-pin connector C224 is located behind center of instrument cluster. Disconnect Rear Anti-lock Brake (RABS) module connector C238. RABS connector C238 is located behind center of dash, to left of ashtray assembly. Disconnect RABS center at top of rear differential. Measure resistance between ground and GEM connector C224 terminal No. 9 (Red/Pink wire). See Figure . Measure resistance between ground and GEM connector C224 terminal No. 18 (Light Green/Black wire). If resistances are 10 k/ohms or less, repair short to ground in Red/Pink or Light Green/Black wire. If resistances are more than 10 k/ohms, go to next step.
  4. Measure resistance of Red/Pink wire between RABS sensor connector and GEM connector terminal No. 9. Measure resistance of Light Green/Black wire between RABS sensor connector and GEM connector C224 terminal No. 18. If resistances are 5 ohms or more, repair open in Red/Pink or Light Green/Black wire. If resistances are less than 5 ohms, go to next step.
  5. Measure voltage between ground and GEM connector C224 terminal No. 9 (Red/Pink wire). Measure voltage between ground and GEM connector C224 terminal No. 18 (Red/Pink wire). If voltage is present, repair short to battery voltage in appropriate Red/Pink wire. If voltage is not present, go to next step.
  6. Using NGS tester, monitor PID VSS_GEM while driving 0-55 MPH. If PID VSS_GEM value is more than zero MPH, go to next step. If PID VSS_GEM value is zero MPH, check RABS sensor. See appropriate ANTI-LOCK BRAKE SYSTEM article in the BRAKES section. If RABS sensor is okay, replace GEM.
  7. Turn ignition off. Remove instrument cluster and disconnect connectors. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Disconnect Powertrain Control Module (PCM). PCM is located at right rear of engine compartment. Disconnect speed control servo. Disconnect Generic Electronic Module (GEM) connector C224. GEM 20-pin connector C224 is located behind center of instrument cluster. Measure resistance between ground and GEM connector C224 terminal No. 1 (Gray/Black wire). See Figure . If resistance is 10 k/ohms or less, repair short to ground in Gray/Black wire. If resistance is more than 10 k/ohms, go to next step.
  8. Measure resistance of Gray/Black wire between instrument cluster connector C215 terminal No. 1 and GEM connector C224 terminal No. 1. See Figure and Figure . If resistance is 5 ohms or more, repair open in Gray/Black wire. If resistance is less than 5 ohms, go to next step.
  9. Turn ignition off. Remove instrument cluster and disconnect connectors. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Disconnect Generic Electronic Module (GEM) connector C224. GEM 20-pin connector C224 is located behind center of instrument cluster. Turn ignition on. Measure voltage between ground and GEM connector C224 terminal No. 1 (Gray/Black wire). See Figure . If voltage is more than 10 volts, repair short to voltage in Gray/Black wire. If voltage is 10 volts or less, go to next step.
  10. Turn ignition off. Measure voltage between ground and instrument cluster connector C216 terminal No. 7 (White/Yellow wire). See Figure . If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less,repair open White/Yellow wire.
    NOTE: Measurements must be made at speedometer gauge pins inside instrument cluster printed circuit clips.
  11. Check printed circuit by making appropriate measurements. See SPEEDOMETER PRINTED CIRCUIT MEASUREMENTS table. If all resistance values are less than one ohm, replace speedometer. See GAUGES  under REMOVAL & INSTALLATION. If resistance in any circuit measurement is one ohm or more, replace instrument cluster printed circuit. See PRINTED CIRCUIT  under REMOVAL & INSTALLATION.
SPEEDOMETER PRINTED CIRCUIT MEASUREMENTS

Connector/Terminal Connector/Terminal No.
Speedometer/S C215/1
Speedometer/G C215/2
Speedometer/B C214/13
Batt C216/7
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