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Chevrolet Silverado / GMC Sierra. Manual - part 1690
Power Distribution Schematics
Ground Distribution Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Immobilizer 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 Testing
1. Engine running, accessories OFF, measure and record the battery voltage at the battery
terminals. The voltage should be between 12.6 and 15.0 volts.
If not within the specified range, refer to Charging System Test.
2. Ignition OFF, disconnect the harness connector at the TDM. Refer to Theft Deterrent
Module Replacement .
3. Ignition OFF, test for less than 5 ohms between the ground circuit terminal 3 and ground.
If greater than the specified range, test the ground circuit for an open/high resistance.
4. Verify that a test lamp illuminates between the B+ circuit terminal 1 and ground.
If the test lamp does not illuminate, test the B+ circuit for a short to ground or an
open/high resistance.
5. If all circuits tests normal, replace the TDM.
Repair Procedures
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Electrical - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for TDM replacement, set up, and programming.
DTC B1516
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 B1516 08
Battery Current Sensor Performance Signal Invalid
DTC B1516 66
Battery Current Sensor Performance Wrong Mounting Position
Diagnostic Fault Information
Circuit/System Description
The BCM supplies 5 volts and ground to the battery current sensor. The battery current sensor
measures the amount of current flowing to or from the battery, and supplies a pulse width
modulation (PWM) signal to the body control module (BCM).
Conditions for Running the DTC
The ignition is ON.
Circuit
Short to
Ground
Open/High
Resistance
Short to
Voltage
Signal
Performance
5-Volt Reference
B1516 00
B1516 00
B1516 00
B1516 00,
B1516 66
Signal
B1516 00
B1516 00
B1516 00
B1516 00,
B1516 66
Low Reference
-
B1516 00
B1516 00
B1516 00,
B1516 66
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Electrical - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
The engine is running.
Conditions for Setting the DTC
The BCM detects a duty cycle of PWM input signal is less than 4 percent or greater than 96
percent for 33 seconds.
Action Taken When the DTC Sets
The SERVICE BATTERY CHARGING SYSTEM warning message will be displayed on the
driver information center (DIC).
Conditions for Clearing the DTC
The DTC clears as current status when the battery sensed current returns to normal range for
5 seconds.
A history DTC will clear after 100 ignition cycles.
Reference Information
Schematic Reference
Starting and Charging Schematics
Body Control System 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
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Electrical - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Control Module References for Scan Tool Information
Circuit/System Verification
Verify that the current sensor is mounted correctly on the battery cable. Refer to Battery
Current Sensor Replacement (4.3L) or Battery Current Sensor Replacement (4.8L, 5.3L,
6.0L, and 6.2L).
Circuit/System Testing
1. Ignition ON, disconnect the battery current sensor.
2. Measure the voltage of the 5 volt reference circuit terminal A. Verify that the 5 volt
reference circuit measures 5 volts.
If the voltage is less than 5 volts, test the current sensor 5 volt reference circuit for a
short to ground, a high resistance, or an open circuit. If the circuit tests normal, replace
the BCM.
3. Measure the voltage of the between the 5-volt reference circuit terminal A and the low
reference circuit terminal B. Verify that there is 5 volts between the 5-volt reference circuit
and the low reference circuit.
If the voltage is less than 5 volts, test the current sensor low reference circuit for a high
resistance, or an open circuit. If the circuit tests normal, replace the BCM.
4. Measure the voltage of the signal circuit terminal C. Verify that the signal circuit measures
4-6 volts.
If the signal circuit voltage is less than 4 volts, test the current sensor signal circuit for
a short to ground, a high resistance, or an open circuit. If the circuit tests normal,
replace the BCM.
If the signal circuit voltage is greater than 6 volts, test the current sensor signal circuit
for a short to voltage. If the circuit tests normal, replace the BCM.
5. If all 3 circuits test normal, replace the battery current sensor.
Repair Procedures
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Battery Current Sensor Replacement (4.3L) or Battery Current Sensor Replacement
(4.8L, 5.3L, 6.0L, and 6.2L)
Control Module References for BCM replacement, setup, and programming
DTC B1517
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Electrical - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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