Chevrolet Silverado / GMC Sierra. Manual — part 657

11. Test for less then 1 ohm between the following low control circuit terminals.

I/P Module - Stage 1 terminal A2 and SDM terminal 11 (with 10 series)

I/P Module - Stage 1 terminal B and SDM terminal 11 (without 10 series)

I/P Module - Stage 2 terminal B2 and SDM terminal 7

Left Front Roof Rail Module terminal A and SDM terminal 12 (regular cab)

Left Front Roof Rail Module terminal 2 and SDM terminal 12 (extended cab)

Right Front Roof Rail Module terminal A and SDM terminal 15 (regular cab)

Right Front Roof Rail Module terminal 2 and SDM terminal 15 (extended cab)

Seat Belt Pretensioner - Left terminal A and SDM terminal 17

Seat Belt Pretensioner - Right terminal A and SDM terminal 18

If not within the specified range, test the circuit for an open/high resistance.

12. If all circuits test normal, replace the SDM.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

SIR/SRS Wiring Repairs

Inflatable Restraint Instrument Panel Module Replacement

Inflatable Restraint Steering Wheel Module Replacement

Inflatable Restraint Steering Wheel Module Coil Replacement

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)

Inflatable Restraint Roof Side Rail Module Replacement (Crew Cab) or Inflatable
Restraint Roof Side Rail Module Replacement (Extended Cab) or Inflatable
Restraint Roof Side Rail Module Replacement (Regular Cab)

Seat Belt Retractor Pretensioner Replacement - Front (Regular Cab) or Seat Belt
Retractor Pretensioner Replacement - Front (Extended Cab) or Seat Belt Retractor
Pretensioner Replacement - Front (Crew Cab)

Control Module References for SDM replacement, programming, and setup

DTC B0052 OR B0053

Diagnostic Instructions

2008 Chevrolet Silverado 1500

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

Silverado

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 B0052 00

Deployment Commanded

DTC B0053 00

Deployment Commanded With Loop DTCs Present

Circuit/System Description

The inflatable restraint sensing and diagnostic module (SDM) contains a sensing device that
converts vehicle velocity changes into an electrical signal. The SDM compares this electrical
signal to a value stored in memory. When the generated signal exceeds the stored value, the SDM
performs additional signal processing and compares the generated signals to values stored in
memory. When 2 of the generated signals exceed the stored values, the SDM will cause current to
flow through the deployment loops, deploying the air bags and/or pretensioners causing DTC
B0052 or B0053 to set.

Conditions for Running the DTC

Ignition voltage is between 9-16 volts.

Conditions for Setting the DTC

B0052

The SDM detects a frontal impact of sufficient force to warrant deployment of the frontal
modules.

The SDM detects a side impact of sufficient force to warrant deployment of a side impact
module and/or roof rail module.

The SDM has deployed the seat belt pretensioner.

B0053

SDM commands inflators deployment with loop faults present.

2008 Chevrolet Silverado 1500

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

Silverado

Action Taken When the DTC Sets

The SDM will only set DTC B0052 or the SDM sets DTC B0053 along with DTC B0052.

The SDM commands the AIR BAG indicator ON.

The SDM records crash data.

Conditions for Clearing the DTC

After an air bag deployment or 3 separate pretensioner deployments the DTC becomes latched
and cannot be cleared.

Reference Information

Schematic Reference

SIR Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

SIR System Description and Operation

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections

Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

IMPORTANT:

The seat belt pretensioners may deploy for impacts that are
not severe enough to warrant frontal or side air bag
deployment. The SDM is capable of sustaining 3 pretensioner

2008 Chevrolet Silverado 1500

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

Silverado

1. Ignition OFF, verify no signs of inflator module or pretensioner deployment exist.

If any signs of deployment exist, refer to Repairs and Inspections Required After a
Collision.

2. Ignition ON, verify DTC B0052 or DTC B0053 is not set.

If the DTC is set, clear DTCs. If DTC resets, replace the SDM.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Refer to Control Module References for SDM replacement, setup, and programming

DTC B0071

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 B0071 03

Passenger Seat Belt Tension Sensor Circuit Voltage Below Threshold

DTC B0071 07

Passenger Seat Belt Tension Sensor Circuit Voltage Above Threshold

Diagnostic Fault Information

deployment events, or one frontal or side deployment event.
After the maximum number of deployments has occurred,
DTC B0052 sets and becomes a latched code, which cannot
be cleared.

When DTC B0053 is accompanied by additional DTCs, other
than B0052, repair the malfunction causing the other DTCs
before replacing SDM.

2008 Chevrolet Silverado 1500

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

Silverado