Chevrolet Silverado / GMC Sierra. Service 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