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Symptom Chart

SYMPTOM CHART

Condition Possible Sources Action
No communication with the instrument cluster
  • Central junction box (CJB) fuse(s):
    • 9 (10A).
    • 10 (15A).
    • 14 (10A).
    • 16 (10A).
    • 28 (10A).
  • Circuitry.
  • J1850 Communication Network (SCP).
  • Instrument cluster.
 Go To PINPOINT TEST A .
No communication with the front electronics module (FEM)
  • Battery junction box (BJB) fuse(s):
    • 2 (10A).
    • 14 (10A).
  • Circuitry.
  • FEM.
 REFER to MULTIFUNCTION ELECTRONIC MODULE .
No communication with the rear electronics module (REM)
  • Central junction box (CJB) fuse(s):
    • 8 (20A).
    • 11 (10A).
  • Circuitry.
  • Rear electronics module (REM).
 REFER to MULTIFUNCTION ELECTRONIC MODULE .
Incorrect fuel gauge indication
  • Fuel tank.
  • Circuitry.
  • Rear electronics module (REM).
  • Fuel level sender.
  • Fuel pump module.
  • Instrument cluster.
 Go To PINPOINT TEST B .
Incorrect temperature gauge indication
  • Circuitry.
  • Powertrain control module (PCM).
  • Engine coolant temperature sender.
  • Instrument cluster.
 Go To PINPOINT TEST C .
The speedometer is inoperative
  • Circuitry.
  • Anti-lock brake system (ABS) module.
  • Instrument cluster.
 Go To PINPOINT TEST D .
The odometer is inoperative
  • Circuitry.
  • Anti-lock brake control module.
  • Instrument cluster.
 Go To PINPOINT TEST E .
The tachometer is inoperative
  • Circuitry.
  • Powertrain control module (PCM).
  • Instrument cluster.
 Go To PINPOINT TEST F .
The safety belt warning indicator is inoperative (chime is operative)/does not operate correctly
  • Circuitry.
  • Safety belt switch (part of buckle end).
  • Restraint control module (RCM).
  • Instrument cluster.
 Go To PINPOINT TEST G .
The door ajar indicator is inoperative (chime is operative)/does not operate correctly
  • Circuitry.
  • Front electronic module (FEM).
  • Rear electronic module (REM).
  • Instrument cluster.
 Go To PINPOINT TEST H .
The brake warning indicator is never/always on
  • Circuitry.
  • Low brake fluid level.
  • Low brake pressure.
  • Parking brake warning indicator switch.
  • Brake fluid level switch.
  • Anti-lock brake system (ABS).
  • Front electronic module (FEM).
  • Instrument cluster.
 Go To PINPOINT TEST I .
The high beam indicator is never on
  • Circuitry.
  • Multifunction switch.
  • Front electronic module (FEM).
  • Instrument cluster.
 Go To PINPOINT TEST J .
The low washer fluid level indicator is never on
  • Circuitry.
  • Low washer fluid level switch.
  • Front electronic module (FEM).
  • Instrument cluster.
 Go To PINPOINT TEST K .
The air bag warning indicator is never on
  • Circuitry.
  • Restraint control module (RCM).
  • Instrument cluster.
 REFER to AIR BAG RESTRAINT SYSTEMS .
The anti-lock brake system (ABS) warning indicator is never on
  • Circuitry.
  • Anti-lock brake system (ABS).
  • Instrument cluster.
 Go To PINPOINT TEST L .
The traction control warning indicator is never on
  • Circuitry.
  • Anti-lock brake system (ABS)/traction control (TC) module.
  • Traction control off switch.
  • Instrument cluster.
 Go To PINPOINT TEST M .
The O/D OFF indicator is never on
  • Circuitry.
  • O/D OFF switch.
  • Powertrain control module (PCM).
  • Instrument cluster.
 Go To PINPOINT TEST N .
The check engine indicator is never on
  • Circuitry.
  • Powertrain control module (PCM).
  • Instrument cluster.
 Go To PINPOINT TEST O .
The check engine indicator is always on
  • Circuitry.
  • Powertrain control module (PCM).
  • Instrument cluster.
 REFER to SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE .
The turn/hazard indicator is never on
  • Circuitry.
  • Multifunction switch.
  • Hazard flasher switch.
  • Instrument cluster.
 Go To PINPOINT TEST P .
The low oil pressure indicator is never on
  • Circuitry.
  • Engine oil pressure.
  • Oil pressure switch.
  • Front electronic module (FEM).
  • Instrument cluster.
 Go To PINPOINT TEST Q .
The charging system warning indicator is never on
  • Circuitry.
  • Generator (GEN) (10300).
  • Powertrain control module (PCM).
  • Instrument cluster.
 Go To PINPOINT TEST R .
The charging system warning indicator is always on
  • Circuitry.
  • Generator (GEN) (10300).
  • Powertrain control module (PCM).
  • Instrument cluster.
 REFER to GENERATORS & REGULATORS .
The anti-theft indicator is never on
  • Circuitry.
  • Powertrain control module (PCM).
  • Instrument cluster.
 REFER to ANTI-THEFT - PATS .
The low tire warning indicator is never on
  • Circuitry.
  • Anti-lock brake system (ABS).
  • Instrument cluster.
 Go To PINPOINT TEST S .
The low tire warning indicator is always on
  • Circuitry.
  • Anti-lock brake system (ABS).
  • Instrument cluster.
 REFER to WHEELS & TIRES .
The speed control indicator is never on
  • Circuitry.
  • Speed control module.
  • Instrument cluster.
 Go To PINPOINT TEST T .
The speed control indicator is always on
  • Speed control module.
  • Instrument cluster.
 REFER to VEHICLE SPEED CONTROL .
The CHECK FUEL CAP indicator is never/always on
  • Instrument cluster.
  • Powertrain control module (PCM).
 Go To PINPOINT TEST U .
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