Convertible Top — 2016 workshop reference 1546

Positive Lead	Measurement / Action	Negative Lead
C4831-8		Ground

Is the resistance greater than 10,000 ohms?

Yes	INSTALL a new convertible top switch. REFER to: Overhead Console (501-12 Instrument Panel and Console, Removal and Installation).
No	REPAIR the circuit.

U0140:00

Refer to Wiring Diagrams Cell 103 for schematic and connector information.

Normal Operation and Fault Conditions

With the ignition ON, the BCM sends messages to the Moveable Roof Control Module A (MRCMA) and Moveable Roof Control Module B (MRCMB) through the GWM over the HS-CAN1. If the Moveable Roof Control Module A (MRCMA) or Moveable Roof Control Module B (MRCMB) does not receive these messages within a certain time frame, the module sets a DTC. For information on the messages sent to the Moveable Roof Control Module A (MRCMA) and Moveable Roof Control Module B (MRCMB) by the BCM, refer to the Network Message Chart. REFER to: Convertible Top - System Operation and Component Description (501-18 Convertible Top, Description and Operation).

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Conditions
	U0140:00 Lost Communication With Body Control Module: No Sub Type Information	This DTC sets in the Moveable Roof Control Module A (MRCMA) and Moveable Roof Control Module B (MRCMB) if the accessory delay status or ignition status message is missing from the BCM.

DTC

Description

Fault Trigger Conditions

U0140:00 Lost Communication With Body

Control Module: No Sub Type Information

This DTC sets in the Moveable Roof Control Module A (MRCMA) and Moveable Roof Control Module B (MRCMB) if the accessory delay status or ignition status message is missing from the BCM.

Possible Sources

Wiring, terminals or connectors Network communication concern GWM BCM

PINPOINT TEST F : U0140:00

F1 CHECK THE COMMUNICATION NETWORK

Ignition ON. Using a diagnostic scan tool, carry out the Network Test.

Do both the BCM and the GWM pass the Network Test?

Yes GO to F2 No DIAGNOSE the no communication with the BCM or GWM.

Original table alignment retained · Scroll horizontally if needed

Source reference 1546

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.