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Backup Lamps Inoperative

PINPOINT TEST 1 - BACKUP LAMPS INOPERATIVE

PINPOINT TEST 1 BACKUP LAMPS ARE INOPERATIVE
STEP INSPECTION ACTION
1 CHECK THE STOPLAMP OPERATION
  • Press and release the brake pedal while observing the rear lamps.
  • Do the stoplamps operate correctly? 
 Yes Go to step 2.
No See SYMPTOM TROUBLESHOOTING CHART - STOPLAMP .
2 CHECK CIRCUIT V/O FOR VOLTAGE
  • Key OFF.
  • Disconnect: Digital Transmission Range (TR) Sensor (Automatic Transmission) 0140-05.
  • Disconnect: Reversing Lamp Switch (Manual Transmission) 0918-603.
  • Key ON.
  • Measure the voltage between the digital TR sensor 0140-05 pin 9, circuit V/O (A/T), harness side and ground; or between the reversing lamp switch 0918-603 pin 2, circuit V/O, harness side and ground.
  • Is the voltage greater than 10 volts? 
 Yes Go to step 4.
No Go to step 3.
3 CHECK THE SMART JUNCTION BOX (SJB) FOR AN OPEN
  • Key OFF.
  • Disconnect: SJB J-2280b.
  • Measure the resistance between the SJB J-2280b pin 7, circuit V/O, component side and the SJB J-2280b pin 17, circuit G/Y, component side.
  • Is the resistance less than 5 ohms? 
 Yes Repair circuit V/O. Test the system for normal operation.
No Go to step 5.
4 CHECK CIRCUIT B/P FOR AN OPEN
  • Key OFF.
  • Measure the resistance between the digital TR sensor 0140-05 pin 11, circuit B/P, harness side and ground; or between the reversing lamp switch 0918-603 pin 1, circuit B/P, harness side and ground.
  • Is the resistance less than 5 ohms? 
 Yes Install a new digital TR sensor or reversing lamp switch. See DIGITAL TRANSMISSION RANGE SENSOR REMOVAL/INSTALLATION .
No Repair the circuit. Test the system for normal operation.
5 CHECK FOR CORRECT SJB OPERATION
  • Key OFF.
  • Disconnect all SJB connectors.
  • Check for:
    • corrosion
    • pushed-out pins
  • Connect all SJB connectors and make sure they seat correctly.
  • Operate the system and verify the concern is still present.
  • Is the concern still present? 
 Yes Install a new SJB. Test the system for normal operation.
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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