PINPOINT TEST B : THE REVERSING LAMP(S) ARE ON CONTINUOUSLY
B1 CHECK THE PCM (POWERTRAIN CONTROL MODULE) COMMANDED GEAR OR REVERSE SWITCH PID (PARAMETER IDENTIFICATION)
Apply the parking brake. Ignition ON. Using a diagnostic scan tool, view PCM Parameter Identifications (PIDs). For manual transmission vehicles, monitor the Reverse Switch (REV_SW) PCM PID. For automatic transmission vehicles, monitor the Gear Commanded (GEAR) PCM PID. Place the gear selector lever in each position.
Does the PID indicate reverse when the gear selector is not in reverse?
Yes | For automatic transmission vehicles, DIAGNOSE the transmission range concern. REFER to: External Controls (307-05 Automatic Transmission External Controls, Diagnosis and Testing). For manual transmission vehicles, GO to B3 |
|---|---|
No | GO to B2 |
B2 CHECK THE REVERSING LAMPS SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE
Ignition OFF. Disconnect: BCM C2280C. Ignition ON.
Does the reversing lamp continue to illuminate?
Yes | REPAIR the circuit. |
|---|---|
No | GO to B6 |
B3 CHECK THE REVERSING LAMP SWITCH
Ignition OFF. Disconnect: Reversing Lamp Switch C169. Ignition ON. Using a diagnostic scan tool, view PCM Parameter Identifications (PIDs). Monitor the Reverse Switch (REV_SW) PCM PID.
Does the PID indicate the transmission is in reverse gear?
Yes | GO to B4 |
|---|---|
No | INSTALL a new reversing lamp switch. REFER to: Reversing Lamp Switch (417-01 Exterior Lighting, Removal and Installation). |
B4 CHECK THE REVERSING LAMP SWITCH INPUT CIRCUIT FOR A SHORT TO GROUND
Ignition OFF. Disconnect: PCM C1551B (2.3L). Disconnect: PCM C1381B (3.7L). Disconnect: PCM C175B (5.0L). Measure:
Click to display connectors
2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.