Fault Code 124: Source Address of Controlling Device for Automated Driving System (ADS)
J1939: SA 3 SPN 15250 FMI 9, 13
Overview
The Transmission Control Module (TCM) receives a Source Address message from the Automated Driving System (ADS) controlling device over the Primary Data Link (J1939A). This information is used to determine transmission operation.
Detection
The TCM monitors Source Address of Controlling Device for ADS Vehicle messages. If messages are not received or are invalid, the fault is set Active.
Conditions to Set Fault Code Active
FMI 9: Abnormal Update Rate: ADS Source Address message not received for 5 seconds.
FMI 13 - Out of Calibration: ADS Source Address messages not available for 5 seconds.
Fallback
FMI 9, 13:
- Amber warning lamp on
- ADS torque control prohibited
Conditions to Set Fault Code Inactive
FMI 9, 13: Source Address of Controlling Device for ADS Vehicle messages received and valid for 10 seconds.
Possible Causes
FMI 9, 13:
- Vehicle Components
- Vehicle Source Address of Controlling Device for ADS Vehicle message not enabled
- Other vehicle ECU(s) faulted
- Vehicle Harness - Primary Data Link (J1939A)
- Shorted to power, shorted to ground or open circuit
- Terminals bent, spread, corroded, or loose
Note: Refer to OEM for troubleshooting a failed system.
Additional Tools
- None
Fault Code 124 Troubleshooting
Record the transmission fault codes, FMIs, occurrences, and timestamps from the Service Activity Report created during the Diagnostic Procedure.
If Fault Code 124 is Inactive and there are other Active vehicle or transmission fault codes, troubleshoot all Active fault codes. Go to Step V
If Fault Code 124 FMI 9 is Active or Inactive, refer to OEM guidelines for repair of the vehicle Source Address of Controlling Device for ADS Vehicle message (SPN 15250). Go to Step V
If Fault Code 124 FMI 13 is Active, refer to OEM and enable vehicle Source Address of Controlling Device for ADS Vehicle message (SPN 15250). Go to Step V
If Fault Code 124 FMI 13 is Inactive, Go to Step V.
Key off.
Reconnect all connectors and verify that all components are properly installed.
Key on with engine off.
Connect ServiceRanger.
Go to “Fault Codes”.
Select “Clear All Faults”.
Operate vehicle and attempt to reset the fault code or duplicate the previous complaint.
Check for fault codes using ServiceRanger.
If no fault codes set and the vehicle operates properly, test complete.
If Fault Code 124 sets Active, Go to Step A
If a fault code other than 124 sets Active, troubleshoot per Fault Code Isolation Procedure Index.