Generic Electronic Module (Gem)

• Description & Operation
  • Notes
  • Gem Controlled Functions
    • Notes
    • Heated Backlight And Mirror Timer
    • Windshield Wiper Control And Interval Timer
    • Front Windshield Wiper Control (With Speed Dependent Interval Wiper)
    • Rear Interval Wiper Control
    • Chime Warning
    • Tone Request
    • Headlamp On Warning
    • Door Ajar Warning
    • Driver Seat Belt Warning
    • Key In Ignition
    • Battery Saver
    • Courtesy Lamps
    • Illuminated Entry
    • Delayed Accessory
    • One-Touch Window
    • Two-Step Unlock
    • Four-Wheel Drive Electronic Shift-On-The-Fly (Ranger)
    • Control Trac
  • CTM Controlled Functions
    • Notes
    • Windshield Wiper/Washer Control
    • Chime Warning
    • Headlamp On Warning
    • Door Ajar Warning
    • Driver Seat Belt Warning
    • Key In Ignition
    • Battery Saver
    • Courtesy Lamps
• Component Locations
• Trouble Shooting
  • Preliminary Inspection
• Self-Diagnostic System
  • Retrieving Diagnostic Trouble Codes
    • Diagnosis Instructions
    • ISO 9141 Data Link Connector (DLC)
    • Test Equipment
    • Detecting and Storing Diagnostic Trouble Codes
    • Detecting Faults in the GEM Output Circuits
    • Reporting Trouble Codes
    • Tester-Dependent Diagnostic Capability and Fault Isolation
    • Vehicle Conditions for On-Demand Self Test
    • Running A Diagnostic Control Test
    • On-Demand Self Test Results
    • Requesting a Parameter Identification (PID)/Data Monitor
  • Clearing Diagnostic Trouble Codes
    • Clearing Continuous DTCs
    • Automatically Clearing Codes
  • On-Demand Self Test (Gem)
    • Notes
    • Using Rotunda New Generation Star (NGS) Tester
    • Interface
    • Active Test Modes
    • Front Windshield Wipers
    • Warning Lamps and Chimes
    • Battery Saver/Illuminated Entry
    • Rear Window Defrost
    • One-Touch Window/Accessory Delay
    • Automatic Ride Control (ARC)
    • Wiggle Test
  • On-Demand Self Test (CTM)
    • Interface
    • Retrieving Diagnostic Trouble Codes (DTC)
    • Step 1 -- Tone and Door Ajar Lamp Test
    • Step 2 -- Trouble Code Output
    • Step 3 -- Input Test
    • Viewing Trouble Codes
    • Erasing Trouble Codes
• System Tests
  • Notes
  • Test A: Cannot Communicate With Gem
  • Test B: Erratic Operation Of Gem Functions
  • Test C: Door Ajar Warning Lamp Stays On
  • Test D: Door Ajar Warning Lamp Fails Prove Out
• Diagnostic Trouble Code Definitions
• Parameter Identification Definitions
• Removal & Installation
  • Notes
  • Generic Electronic Control Module (Gem), Central Timer Module (CTM)
    • Removal & Installation
• Torque Specifications
• Wiring Diagrams