concern Electronic Engine Controls - 2.3L EcoBoost
(231kW/314PS), Diagnosis and Testing). REFER to: Electronic Engine Controls (303-14B Electronic Engine Controls - 3.7L Duratec (227kW/301PS), Diagnosis and Testing). REFER to: Electronic Engine Controls (303-14C Electronic Engine Controls - 5.0L 32V Ti-VCT/5.0L Ti-VCT V8 (308kW/418PS), Diagnosis and Testing). RETRIEVE and RECORD all Moveable Roof Control Module A (MRCMA), Moveable Roof Control Module B (MRCMB) and GWM Diagnostic Trouble Codes (DTCs). GO to the DTC Chart: Moveable Roof Control Module A (MRCMA), the DTC Chart: Moveable Roof Control Module B (MRCMB) or REFER to: Communications Network (418-00 Module Communications Network, Diagnosis and Testing).
Pinpoint Tests
The Convertible Top Is Inoperative
Refer to Wiring Diagrams Cell 103 for schematic and connector information.
Normal Operation and Fault Conditions
The convertible top is controlled through the use of a switch, the switch must be held in place during convertible top operation. Voltage for convertible top operation is supplied to the Moveable Roof Control Module A (MRCMA) and Moveable Roof Control Module B (MRCMB) from the BJB. There are several requirements which must be met before the convertible top can be opened or closed, REFER to: Convertible Top - Overview (501-18 Convertible Top, Description and Operation). For additional convertible
Circuit faults, a convertible top switch failure, network communication errors, invalid network data or an internal failure of one or more modules listed below prevents the convertible top from operating.
Possible Sources
Fuses Wiring, terminals or connectors Convertible top switch Tonneau covers installed Vehicle speed concern Network communication concern Rear window concern Moveable Roof Control Module A (MRCMA) Moveable Roof Control Module B (MRCMB) BCMB concern GWM concern BCM concern PCM concern
Visual Inspection and Diagnostic Pre-checks
Make sure the tonneau covers are not installed. Make sure BJB fuses 15 (20A) and 17 (20A) are OK.
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