The inflatable restraint front end sensor is a crash sensing device used in the detection of a frontal collision. The front end sensor is used by the inflatable restraint sensing and diagnostic module (SDM) to help determine whether or not certain frontal crashes are severe enough to warrant deployment of the frontal air bags. The SDM applies voltage to the sensor - reference circuit and monitors the voltage at the sensor - signal circuit in order to verify proper circuit integrity. If the SDM detects a malfunction within the sensor circuit, a DTC will be set.
This diagnostic procedure supports the following DTC:
DTC B1615 Left Frontal Restraints Sensor
Ignition 1 voltage is within the normal operating voltage range.
The SDM detects a malfunction in the inflatable restraint front end sensor - left circuit.
The SDM commands the AIR BAG indicator ON.
The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used.
Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with the reappearance of the malfunction.
The following are possible causes of the malfunction:
• | An open or high resistance in the front end sensor - left circuits |
• | A short to ground or voltage in the front end sensor - left circuits |
• | A short between the front end sensor - left circuits |
• | An internal front end sensor - left malfunction |
• | An internal SDM malfunction |
If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections .
The number below refers to the step number on the diagnostic table.
Step | Action | Yes | No | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: SIR Schematics Connector End View Reference: SIR Connector End Views | |||||||||||||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |||||||||||
2 |
Did you find and correct the condition? | Go to Step 9 | Go to Step 3 | ||||||||||
3 |
Is DTC 1615 set as a current DTC? | Go to Step 5 | Go to Step 4 | ||||||||||
4 | Is DTC 1610 set as a current DTC? | Go to Step 7 | Go to Diagnostic Aids | ||||||||||
5 |
Did you find and correct the condition? | Go to Step 9 | Go to Step 6 | ||||||||||
Test the front end sensor - left - signal and the front end sensor - left - reference circuits for the following conditions:
Did you find and correct the condition? | Go to Step 9 | Go to Step 8 | |||||||||||
7 | Replace the inflatable restraint front end sensor - left. Refer to Inflatable Restraint Front End Sensor Replacement - Left Side . Did you complete the replacement? | Go to Step 9 | -- | ||||||||||
8 | Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement . Did you complete the replacement? | Go to Step 9 | -- | ||||||||||
9 |
Does the DTC reset? | Go to Step 2 | System OK |