Chevrolet Silverado / GMC Sierra. Manual — part 663
LR Side Impact Sensor Internal Electronic Failure
DTC B0087 3A
LR Side Impact Sensor Incorrect Component Installed
DTC B0087 71
LR Side Impact Sensor Invalid Serial Data Received
DTC B0088 00
RR Side Impact Sensor No Additional Information
DTC B0088 0F
RR Side Impact Sensor Erratic
DTC B0088 39
RR Side Impact Sensor Internal Electronic Failure
DTC B0088 3A
RR Side Impact Sensor Incorrect Component Installed
DTC B0088 71
RR Side Impact Sensor Invalid Serial Data Received
Diagnostic Fault Information
Circuit
Short to
Ground
High
Resistance
Open
Short to
Voltage
Signal
Performance
Front End Sensor 1 High
Circuit
B0083 00 B0083 0F B0083 00 B0083 00
B0083 0F
Front End Sensor 1 Low
Circuit
B0083 00 B0083 0F B0083 00 B0083 00
B0083 0F
Front End Sensor 2 High
Circuit
B0084 00 B0084 0F B0084 00 B0084 00
B0084 0F
Front End Sensor 2 Low
B0084 00 B0084 0F B0084 00 B0084 00
B0084 0F
2008 Chevrolet Silverado 1500
2008 RESTRAINTS Supplemental Inflatable Restraints - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
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
Any of the following conditions exist for 2.5 seconds:
B0083 00, B0084 00, B0085 00, B0086 00, B0087 00, B0088 00
Circuit
Left Front Side Impact
Sensor High Circuit
B0085 00 B0085 0F B0085 00 B0085 00
B0085 0F
Left Front Side Impact Low
Circuit
B0085 00 B0085 0F B0085 00 B0085 00
B0085 0F
Right Front Side Impact
Sensor High Circuit
B0086 00 B0086 0F B0086 00 B0086 00
B0086 0F
Right Front Side Impact Low
Circuit
B0086 00 B0086 0F B0086 00 B0086 00
B0086 0F
Left Rear Side Impact Sensor
High Circuit
B0087 00 B0087 0F B0087 00 B0087 00
B0087 0F
Left Rear Side Impact Low
Circuit
B0087 00 B0087 0F B0087 00 B0087 00
B0087 0F
Right Rear Side Impact
Sensor High Circuit
B0088 00 B0088 0F B0088 00 B0088 00
B0088 0F
Right Rear Side Impact Low
Circuit
B0088 00 B0088 0F B0088 00 B0088 00
B0088 0F
2008 Chevrolet Silverado 1500
2008 RESTRAINTS Supplemental Inflatable Restraints - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
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.
B0083 0F, B0084 0F, B0085 0F, B0086 0F, B0087 0F, B0088 0F
The SDM has received erratic messages from the front end sensor.
B0083 39, B0084 39, B0085 39, B0086 39, B0087 39, B0088 39
The SDM has received a Not Ok (NOK) message from the front end sensor.
The SDM has not received a message.
The SDM has received invalid serial data from the front end sensor.
B0083 3A, B0084 3A, B0085 3A, B0086 3A, B0087 3A, B0088 3A
The SDM has received an ID message from the front end sensor, which does not match the
ID stored in the SDM memory.
The SDM has reset the front end sensor twice without detecting the correct ID message.
B0083 71, B0084 71, B0085 71, B0086 71, B0087 71, B0088 71
The SDM has received invalid serial data from the front end sensor.
Action Taken When the DTC Sets
The SDM commands the AIR BAG indicator ON.
The SIR System is disabled and no deployments are allowed.
Conditions for Clearing the DTC
The condition for setting the DTC no longer exists.
A history DTC will clear once 100 malfunction-free ignition cycles have occurred.
Reference Information
Schematic Reference
SIR Schematics
2008 Chevrolet Silverado 1500
2008 RESTRAINTS Supplemental Inflatable Restraints - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Connector End View Reference
Component Connector End Views
Description and Operation
SIR System Description and Operation
Electrical Information Reference
Circuit Testing
Testing for Intermittent Conditions and Poor Connections
Connector Repairs
Wiring Repairs
Scan Tool Reference
Control Module References for scan tool information.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the appropriate sensor.
2. Disconnect the harness connector at the SDM.
3. Ignition ON, test for less than 1 volt between the following signal circuit and ground.
Right front end sensor terminal 1
Left front end sensor terminal 1
Right front side impact sensor terminal B
Left front side impact sensor terminal B
IMPORTANT: Refer to SIR Service Precautions.
When removing connectors, inspect for damage or corrosion.
Damage or corrosion in the following requires repair or
replacement of the affected component/connector:
The front end sensor
The SDM module
The front end sensor wiring harness connector
The SDM wiring harness connector
2008 Chevrolet Silverado 1500
2008 RESTRAINTS Supplemental Inflatable Restraints - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
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