Chevrolet Silverado / GMC Sierra. Service manual — part 668

PPS module. The instrument panel cluster (IPC) grounds all indicator control circuits to the
passenger air bag ON/OFF indicators for illumination. The IPC receives serial data messages
from the supplemental inflatable restraints system to turn ON the indicators as necessary.

After the SDM is programmed, the SDM setup procedure is required. During this set up
procedure, the SDM will compare the content that was just programmed to the actual components
that are installed on the vehicle. If the SDM detects that there are too few or too many
components on the system, DTC B1019 00 will set and not allow the setup procedure to
complete.

Conditions for Running the DTC

Ignition voltage is between 9-16 volts.

Conditions for Setting the DTC

B1019 00

The SDM was programmed with the wrong options for the vehicle.

The wrong components were installed for the content of the vehicle.

SDM connector may have bent pins or shorting bars causing the SDM to learn deployment
loops that are not actually present.

B1019 3A

The vehicle was configured for passenger presence system (PPS) but the SDM does not
detect that the PPS indicator is present due to loss of power at indicator.

The vehicle is not configured for PPS and the SDM detects that the PPS indicator is
present.

Action Taken When the DTC Sets

The SDM commands the AIR BAG warning lamp ON.

The SDM disables all deployments when B1019 00 DTC is set as current.

Conditions for Clearing the DTC

The correct SDM must be installed.

The correct components must be installed.

The PPS indicator operates as indicated in the SIR System Description and Operation.

2008 Chevrolet Silverado 1500

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

Silverado

Diagnostic Aids

If the SDM has been replaced, make sure that the correct part number was installed for this
vehicle. If after programming the SDM DTC B1019 00 sets as current, check for bent pins or
shorting bars at the SDM connector.

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

Testing for Intermittent Conditions and Poor Connections

Connector Repairs

Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

B1019 3A

1. With a scan tool, verify DTC B1370 is not set as current in the SDM.

If DTC is current refer to DTC B1370.

2. If equipped with PPS, verify the appropriate PPS indicator segments illuminate by

occupying and un-occupying the passenger seat.

If the PPS indicator segments do not illuminate properly, refer to Passenger Presence
System Indicator Circuit Malfunction.

2008 Chevrolet Silverado 1500

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

Silverado

Circuit/System Testing

B1019 00

1. Ignition ON, verify the scan tool End Model Part Number is correct for the vehicle.

If the part number is incorrect, reprogram the SDM.

2. Observe the scan tool PPS Options parameter to determine how the vehicle PPS is currently

configured in the SDM. Verify the actual vehicle equipment and the current configuration
indicated by the scan tool parameter are the same.

If the original configuration does not match the actual vehicle equipment, reprogram
the SDM with the correct configuration.

3. Ignition OFF, disconnect the harness connectors at the SDM and verify the connector is in

good condition and has no bent pins, terminals or shorting bars

If damage is found, repair the bent pins, terminals or shorting bars as needed and
perform the Setup New SDM procedure.

4. Connect the harness connector at the SDM.

5. Ignition ON, verify the scan tool System Configuration matches the actual components

installed on the vehicle.

If the System Configuration does not match the actual components installed, reprogram
the SDM with the correct components.

IMPORTANT: When removing connectors inspect for damage or corrosion.

Damage or corrosion in the following requires repair or
replacement of the affected.

The PPS module

SDM

The PPS module wiring harness connector

SDM wiring harness connector

IMPORTANT:

If not equipped with PPS, the scan tool parameter should
display Not Present and the PPS indicator should not be
present on the vehicle

If equipped with PPS, the scan tool parameter should
display Auto, Manual, or Auto + Man and the PPS
indicator should be present on the vehicle

2008 Chevrolet Silverado 1500

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

Silverado

6. Ignition ON, clear all PPS and SDM DTCs.

7. Verify DTC B1019 does not set.

If DTC sets, replace the SDM.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

SIR/SRS Wiring Repairs

Control Module References for SDM or BCM replacement, setup, and programming

DTC B1370

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using the 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 B1370 01

Device Ignition 1 Circuit Short to Battery

DTC B1370 06

Device Ignition 1 Circuit Short to Ground or Open

Diagnostic Fault Information

Circuit/System Description

The inflatable restraint sensing and diagnostic module (SDM) monitors the ignition 1 signal from
the ignition switch. When the vehicle ignition switch is placed in the RUN or CRANK position,
the switch supplies voltage to the SDM ignition 1 input terminal. If an open, short to voltage, or
short to ground in this SDM ignition 1 circuit is detected, then DTC B1370 will set.

Circuit

Short to

Ground

Open/High

Resistance

Short to

Voltage

Signal

Performance

Ignition 1 Voltage

B1370 06

B1370 06

B1370 01

B1370 06

2008 Chevrolet Silverado 1500

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

Silverado