U0253:00
Normal Operation and Fault Conditions
The RCM uses information contained in messages from the APIM sent on the HS-CAN .
DTC Fault Trigger Conditions
DTC | Description | Fault Trigger Conditions |
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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 . |
Possible Causes
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: Only disconnect or reconnect SRS components 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 | ||||
Does the APIM pass the network test?
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A2 CHECK THE RCM (RESTRAINTS CONTROL MODULE) CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODES (CMDTCS) | ||||
Is DTC U0253:00 retrieved again?
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A3 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE RCM (RESTRAINTS CONTROL MODULE) SELF-TEST | ||||
Is DTC U3003:16 or U3003:17 recorded?
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A4 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE APIM (SYNC MODULE) SELF-TEST | ||||
Is DTC U3003:16 or U3003:17 recorded?
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A5 CHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) U0253:00 SET IN OTHER MODULES | ||||
Is DTC U0253:00 set in the ACM ?
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Removal
NOTICE: If the fluid is spilled on the paintwork, the affected area must be immediately washed down with cold water.
NOTE: Removal steps in this procedure may contain installation details.
All vehicles
Remove the battery tray.