2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 236
DTC B0091 00
- Front End Sensor 3 No Additional Information (Center)
DTC B0091 01
- Front End Sensor 3 Short to Battery (Center)
DTC B0091 02
- Front End Sensor 3 Short to Ground (Center)
DTC B0091 05
- Front End Sensor 3 Short to Battery or Open (Center)
DTC B0091 0F
- Front End Sensor 3 Erratic (Center)
DTC B0091 39
- Front End Sensor 3 Internal Electronic Failure (Center)
DTC B0091 3A
- Front End Sensor 3 Incorrect Component Installed (Center)
DTC B0091 71
- Front End Sensor 3 Invalid Serial Data Received (Center)
Circuit/System Description
The inflatable restraint front end sensor utilizes a unidirectional 2-wire circuit. The front end sensor modulates current on the interface to send ID,
state of health, and deployment commands to the inflatable restraint sensing and diagnostic module (SDM). The SDM serves as a power source and
a ground for the front end sensor. When the ignition is turned ON and input power from the SDM is first detected, the front end sensor responds by
performing internal diagnostics and sending an ID to the SDM. The SDM considers the ID to be valid if the response time is less than 5 seconds.
The front end sensor continually communicates status messages to the SDM, which determines if a fault is present in the front end sensor circuit.
When a fault is detected, the SDM may reset the front end sensor up to 2 times by removing and reapplying power to it. If the fault is still present,
the SDM will set a DTC.
Conditions for Running the DTC
Ignition voltage is between 9-16 volts.
Conditions for Setting the DTC
B0091 00
* The front end sensor has been shorted to voltage, open, or shorted to ground.
* The front end sensor current has been above 23 mA for longer than 5 milliseconds.
* The SDM has not received a message from the front end sensor for more than 375 milliseconds.
B0091 01
* The front end sensor has been shorted to voltage.
* The front end sensor current has been above 23 mA for longer than 5 milliseconds.
* The SDM has not received a message from the front end sensor for more than 375 milliseconds.
B0091 02
* The front end sensor has been shorted to ground.
* The front end sensor current has been above 23 mA for longer than 5 milliseconds.
* The SDM has not received a message from the front end sensor for more than 375 milliseconds.
B0091 05
* The front end sensor has been shorted to voltage.
* The front end sensor circuit is open.
* The front end sensor current has been above 23 mA for longer than 5 milliseconds.
* The SDM has not received a message from the front end sensor for more than 375 milliseconds.
B0091 0F
The SDM has received erratic messages from the front end sensor.
B0091 39
* The SDM has received a NOK message from the front end sensor.
* The SDM has not received a message.
