Visual Inspection and Diagnostic Pre-checks
PINPOINT TEST A : THE REVERSING LAMP IS INOPERATIVE
A1 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 in REVERSE (R).
Does the PID indicate the gear range is in reverse?
Yes | GO to A2 |
|---|---|
No | 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 A7 |
A2 CHECK FOR VOLTAGE TO THE REVERSING LAMP
Ignition OFF. Apply the parking brake. Disconnect: Except China, Reversing Lamp C496. Disconnect: China Only, Rear Fog Lamp C436. Ignition ON. Place the gear selector in REVERSE (R). Except China, measure:
Click to display connectors
Positive Lead | Measurement / Action | Negative Lead |
|---|---|---|
C496-3 | Ground |
China only, measure:
Click to display connectors
Positive Lead | Measurement / Action | Negative Lead |
|---|---|---|
C436-2 | Ground |
Is the voltage greater than 11 volts?
Yes | GO to A4 |
|---|---|
No | GO to A3 |
A3 REPEAT THE ON-DEMAND SELF-TEST AND CHECK FOR VOLTAGE TO THE REVERSING LAMP
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.