Chevrolet Silverado / GMC Sierra. Service manual — part 664

Right rear side impact sensor terminal B

Left rear side impact sensor terminal B

If greater than the specified range, test the circuit for a short to voltage.

4. Ignition ON, test for less than 1 volt between the low reference circuit and ground.

Right front end sensor terminal 2

Left front end sensor terminal 2

Right front side impact sensor terminal A

Left front side impact sensor terminal A

Right rear side impact sensor terminal A

Left rear side impact sensor terminal A

If greater than the specified range, test the circuit for a short to voltage.

5. Test for infinite resistance between the 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

Right rear side impact sensor terminal B

Left rear side impact sensor terminal B

If less than infinite resistance, test the circuit for a short to ground.

6. Test for less than 1 ohm between the following signal circuit terminals.

Right front end sensor terminal 1 and SDM harness connector terminal 37.

Left front end sensor terminal 1 and SDM harness connector terminal 36.

Right front side impact sensor terminal B and the SDM harness connector terminal 43.

Left front side impact sensor terminal B and the SDM harness connector terminal 42.

Right rear side impact sensor terminal B and the SDM harness connector terminal 45.

Left rear side impact sensor terminal B and the SDM harness connector terminal 44.

If greater than the specified range, test the circuit for an open/high resistance.

7. Test for less then 1 ohm between the following front end sensor low reference circuit

terminals.

Right front end sensor terminal 2 and SDM harness connector terminal 39.

Left front end sensor terminal 2 and SDM harness connector terminal 38.

Right front side impact sensor terminal A and the SDM harness connector terminal 41.

2008 Chevrolet Silverado 1500

2008 RESTRAINTS Supplemental Inflatable Restraints - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

Left front side impact sensor terminal A and the SDM harness connector terminal 40.

Right rear side impact sensor terminal A and the SDM harness connector terminal 47.

Left rear side impact sensor terminal A and the SDM harness connector terminal 46.

If greater than the specified range, test the circuit for an open/high resistance.

8. If all circuits test normal, replace the appropriate sensor.

9. Reconnect all SIR components. Ignition ON, with a scan tool clear and check for DTCs.

If the DTC returns and is current, replace the SDM.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Inflatable Restraint Front End Sensor Replacement (2500, 3500) or Inflatable
Restraint Front End Sensor Replacement (1500)

Inflatable Restraint Side Impact Sensor Replacement (Extended Cab) or Inflatable
Restraint Side Impact Sensor Replacement (Crew Cab) or Inflatable Restraint Side
Impact Sensor Replacement (Crew Cab/Extended Cab/Regular Cab)

SIR/SRS Wiring Repairs

Control Module References for SDM replacement, setup, and programming

DTC B0090

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC B0090 00

Rollover Sensor No Additional Information

DTC B0090 0F

Rollover Sensor Erratic

DTC B0090 3A

2008 Chevrolet Silverado 1500

2008 RESTRAINTS Supplemental Inflatable Restraints - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

Rollover Sensor Incorrect Component Installed

DTC B0090 39

Rollover Sensor Internal Electronic Failure

DTC B0090 71

Rollover Sensor Invalid Serial Data Received

Diagnostic Fault Information

Circuit/System Description

The inflatable restraint vehicle rollover sensor (ROS) utilizes battery power supply and a
bidirectional interface circuit. The ROS modulates current on the interface to send ID, State of
Health, and deployment commands to the inflatable restraint sensing and diagnostic module
(SDM). When the ignition is turned on the ROS responds by performing internal diagnostics and
sending an ID to the SDM. The ROS continually communicates status messages to the SDM,
which determines if a fault is present in the ROS circuit. If the fault is present, the SDM will set a
diagnostic trouble code (DTC).

Conditions for Running the DTC

Ignition voltage is between 9-16 volts.

Conditions for Setting the DTC

All of the following conditions must exist for 5 seconds:

B0090 0F

The SDM received a fault present message from the ROS.

The ROS is in assembly plant mode and the SDM is in production mode.

Circuit

Short to

Ground

High

Resistance

Open

Short to

Voltage

Signal

Performance

Battery Positive Voltage

B0090 0F B0090 0F B0090 0F

-

B0090 0F

Roll Over Sensor Ground

-

B0090 0F B0090 0F

-

B0090 0F

Roll Over Sensor High
Signal

B0090 0F B0090 0F B0090 0F B0090 0F

B0090 0F

2008 Chevrolet Silverado 1500

2008 RESTRAINTS Supplemental Inflatable Restraints - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

The SDM has not received any data from the ROS.

B0090 3A

The SDM has received an ID message from the vehicle rollover sensor which does not
match the ID stored in the SDM memory.

The SDM has reset the vehicle rollover sensor twice without detecting the correct ID
message.

B0090 39

The SDM has received a Not Ok (NOK) message from the vehicle rollover sensor.

The SDM has not received a message.

B0090 71

The SDM has received invalid serial data from the vehicle rollover sensor.

Action Taken When the DTC Sets

The SDM commands the AIR BAG indicator ON.

The side air bag deployment loops will be disabled for rollover events only. For side impact
events the side air bags are still enabled.

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.

Diagnostic Aids

If either the SDM or vehicle rollover sensor were replaced verify that the correct part numbers
were used for the vehicle application and the components were properly configured. Refer to
Control Module References for SDM and ROS setup and programming.

Reference Information

Schematic Reference

SIR Schematics

Connector End View Reference

2008 Chevrolet Silverado 1500

2008 RESTRAINTS Supplemental Inflatable Restraints - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado