Pinpoint Test - DTC: T, Coupe
B1405:11, B1405:12, B1405:13, B1405:1A
Refer to Wiring Diagrams Cell 46 for schematic and connector information.
Normal Operation and Fault Conditions
The RCM continuously monitors the LH side air curtain circuits for the following faults:
Resistance out of range Unexpected voltage Short to ground Faulted LH side air curtain
If a fault is detected, the RCM stores DTC B1405:11, B1405:12, B1405:13 or B1405:1A in memory and sends a message to the IPC to illuminate the airbag warning indicator.
The RCM analyzes the deployment loop resistance to determine if a fault exists. The value displayed in the PID is the deployment loop resistance measured by the RCM. If the value displayed is lower or higher than the desired range (refer to diagram below), the RCM can set a DTC. As the deployment loop resistance drifts farther outside the desired range, the chance for a DTC increases. Small variations in resistance can occur due to the effect of road vibrations on terminal fit. Crimps and terminals can be affected by stress and harness movement and can cause an increase in resistance due to wire strain. These variables can result in an intermittent fault. For this reason, the test requires the PID value to be within the desired range before the fault is considered repaired, regardless if the module is reporting an on-demand DTC at the time of diagnosis. Following this direction helps make sure that minor changes in resistance do not create a repeat concern. This test uses process of elimination to diagnose each part of the deployment loop circuit including:
Wiring Connections LH side air curtain RCM
DTC Fault Trigger Conditions
Description | Fault Trigger Conditions | |||
|---|---|---|---|---|
DTC | ||||
B1405:11 | Driver Side Curtain Deployment Control 1: Circuit Short to Ground | A fault is indicated when the RCM senses a short to ground on either LH side air curtain circuit for more than 6 seconds. | ||
B1405:12 | Driver Side Curtain Deployment Control 1: Circuit Short to Battery | A fault is indicated when the RCM senses a short to voltage on either LH side air curtain circuit for more than 6 seconds. | ||
B1405:13 | Driver Side Curtain Deployment Control 1: Circuit Open | A fault is indicated when the RCM measures more than the desired resistance between the LH side air curtain circuits for more than 6 seconds. | ||
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.