Chevrolet Silverado / GMC Sierra. Service manual — part 1689

DTC B1325 4A

Device Power Circuit Checksum Error - IPC

Diagnostic Fault Information

Circuit/System Description

The control modules on this vehicle monitor the battery voltage through the battery positive (B+)
voltage circuits. This vehicle has multiple modules that will set the DTC. For more information
on which modules, refer to Diagnostic Trouble Code (DTC) List - Vehicle .

Conditions for Running the DTC

The engine is running.

The battery voltage supplied to the control modules is in the range of 7-26 volts.

Conditions for Setting the DTC

B1325 03

The control module detects that the system voltage is less than 9 volts for 5 seconds.

B1325 07

The control module detects that the system voltage is greater than 18 volts for 5 seconds.

B1325 4A

The instrument panel cluster (IPC) failed the power on checksum test, either due to low voltage
or corrupted memory.

Action Taken When the DTC Sets

The control module immediately disables all outputs when an out of range voltage condition
has been detected, with the exception of GMLAN and the Run/Crank relay, which are
disabled after a 3 minute delay.

Circuit

Short to

Ground

Open/High

Resistance

Short to

Voltage

Signal

Performance

B+

B1325 03,

4A

B1325 03, 4A

-

-

Ground

-

B1325 03, 4A

-

-

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Electrical - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

The setting of other DTCs is inhibited.

Conditions for Clearing the DTC

The DTC clears when the malfunction is no longer present.

Diagnostic Aids

A high or low voltage value in multiple modules indicates a concern in the charging system.

Overcharging with a battery charger or jump starting can cause this DTC to set.

Reference Information

Schematic Reference

Control Module References

Power Distribution Schematics

Ground Distribution Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Charging 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

1. Engine running, accessories OFF, measure and record the battery voltage at the battery

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Electrical - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

terminals. The voltage should be between 12.6 and 15.0 volts.

If not within the specified range, refer to Charging System Test.

2. Observe the appropriate module scan tool Battery Voltage parameter. The reading should

be between 12.6 and 15.0 volts.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connectors at the appropriate module.

2. Ignition OFF, test for less than 5 ohms of resistance between the ground circuit and ground.

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

3. Verify that a test lamp illuminates between the B+ circuit terminals and ground.

If the test lamp does not illuminate, test the B+ circuit for a short to ground or an
open/high resistance.

4. If all circuits tests normal, replace the appropriate module.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for the appropriate module replacement, setup, and programming.

DTC B1424

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 Descriptor

DTC B1424 00

Device Voltage Low - Theft Deterrent Module

Diagnostic Fault Information

Circuit

Short to

Ground

Open/High

Resistance

Short to

Voltage

Signal

Performance

B+

B1424 00

B1424 00

-

-

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Electrical - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Circuit/System Description

The theft deterrent module (TDM) monitors the battery positive (B+) voltage available to it. If
the voltage at the TDM is between 6-9 volts, and the voltage being reported by a serial data
message is greater than 9 volts, then DTC B1424 00 sets.

Conditions for Running the DTC

The ignition switch is in Accessory or Run.

This diagnostic runs every 100 milliseconds.

Conditions for Setting the DTC

Voltage at the TDM B+ circuit is between 6-9 volts.

Reported battery voltage received via serial data is valid and is greater than 9 volts.

The above conditions have been met for 2 seconds.

Action Taken When the DTC Sets

The security indicator turns ON.

The driver information center (DIC) displays the SERVICE THEFT DETERRENT
SYSTEM message.

Conditions for Clearing the DTC

A current DTC clears when the battery voltage at the TDM is greater than 9 volts, or if the
voltage reported by serial data is less than 9 volts.

A history DTC clears after 100 consecutive ignition cycles, if no failures are reported by
this diagnostic.

Diagnostic Aids

A low voltage DTC in multiple modules indicates a concern in the charging system.

Verify that the ground terminal G201 is clean and tight.

Reference Information

Schematic Reference

Immobilizer Schematics

Ground

-

B1424 00

-

-

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Electrical - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado