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Chevrolet Silverado / GMC Sierra. 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
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