Pinpoint Test - DTC: AH
U0253:00
Normal Operation and Fault Conditions
The RCM uses information contained in messages from the APIM sent on the High Speed Controller Area Network 2 (HS2-CAN).
DTC Fault Trigger Conditions
Description | Fault Trigger Conditions |
|---|---|
U0253:00 Lost Communication with Accessory Protocol Interface Module: No Sub Type Information | This DTC sets if the RCM does not receive an expected message from the APIM. |
DTC
Possible Sources
Network traffic APIM RCM
PINPOINT TEST A : U0253:00
WARNING: Do not handle, move or change the original horizontal mounting position of the Restraints Control Module (RCM) while the Restraints Control Module (RCM) is connected and the ignition switch is ON. Failure to follow this instruction may result in the accidental deployment of the Safety Canopy® and cause serious personal injury or death.
NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test.
NOTE: SRS components should only be disconnected or reconnected when instructed to do so within a pinpoint test step. Failure to follow this instruction may result in incorrect diagnosis of the SRS.
NOTE: Always make sure the correct SRS component is being installed. Parts released for other vehicles may not be compatible even if they appear physically similar. Check the part number listed in the Ford parts catalog to make sure the correct component is being installed. If an incorrect SRS component is installed, Diagnostic Trouble Codes (DTCs) may set.
NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
A1 CHECK THE COMMUNICATION NETWORK
Ignition ON. Using a diagnostic scan tool, carry out a network test.
Does the APIM pass the network test?
Yes | GO to A2 |
|---|---|
No | To diagnose no communication with the APIM, REFER to: Communications Network (418-00 Module Communications Network, Diagnosis and Testing). |
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.