Hybrid Engine Electrical System (hp2) Cadillac Escalade GMT900

Fastener Tightening Specifications

Battery Usage

Scheme 8

DIAGNOSTIC CODE INDEX

DIAGNOSTIC CODE INDEX

Diagnostic Instructions

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

Circuit/System Description

The control modules on this vehicle monitor the battery voltage on the 12V battery positive (B+) voltage circuits. This vehicle has multiple modules that will set the DTC. For information about which modules, refer to Diagnostic Trouble Code (DTC) List - Vehicle .

Conditions for Running the DTC

1. The 12V battery voltage supplied to the control modules is in the range of 7-26 volts.
2. The engine is running.

B1325 03

The control module detects that the 12V system voltage is less than 9 volts for 5 seconds.

B1325 07

The control module detects that the 12V system voltage is greater than 18 volts for 5 seconds.

Action Taken When the DTC Sets

1. The control module immediately disables all outputs when an out of range voltage condition has been detected, with the exception of GMLAN, which is disabled after a 3 minute delay.
2. The setting of other DTCs is inhibited.

Conditions for Clearing the DTC

The DTC clears when the malfunction is no longer present.

Diagnostic Aids

1. A high or low voltage value in multiple modules indicates a concern in the charging system.
2. Overcharging with a battery charger can cause this DTC to set.

Reference Information

Schematic Reference

1. «Control Module References»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references)
2. «Power Distribution Schematics»(/cadillac/escalade/gmt900-2006-2014/remont/body-electrical/#wiring-systems-and-power-management-schematic-and-wiring-harness-routing-diagrams)
3. «Ground Distribution Schematics»(/cadillac/escalade/gmt900-2006-2014/remont/body-electrical/#wiring-systems-and-power-management-schematic-and-wiring-harness-routing-diagrams)

Connector End View Reference

Component Connector End Views

Description and Operation

Charging System Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__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 12V battery terminals. The voltage should be between 12.6 and 15.0 volts. If not within the specified range, refer to «Charging System Test»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2__charging-system-test) .
2. Ignition OFF, disconnect the harness connectors at the appropriate module.
3. Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 ohms between the ground circuit 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 12V B+ circuit terminals and ground. If the test lamp does not illuminate, test the 12V B+ circuit for a short to ground or an open/high resistance.
5. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminals and ground. If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
6. If all circuits test 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.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The theft deterrent module (TDM) monitors the 12V 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.

1. The ignition switch is in Accessory or Run.
2. This diagnostic runs every 100 milliseconds.

Conditions for Setting the DTC

1. Voltage at the TDM 12V B+ circuit is between 6-9 volts.
2. Reported 12V battery voltage received via serial data is valid and is greater than 9 volts.
3. The above conditions have been met for 2 seconds.

1. The security indicator turns ON.
2. The driver information center (DIC) displays the SERVICE THEFT DETERRENT SYSTEM message.

1. A current DTC clears when the 12V B+ at the TDM is greater than 9 volts, or if the voltage reported by serial data is less than 9 volts.
2. A history DTC clears after 100 consecutive ignition cycles, if no failures are reported by this diagnostic.

1. A low voltage DTC in multiple modules indicates a concern in the 12V charging system.
2. Verify that the ground terminal G201 is clean and tight.

Schematic Reference

1. «Immobilizer Schematics»(/cadillac/escalade/gmt900-2006-2014/remont/door-locks-anti-theft-systems/#immobilizer-system)
2. «Starting and Charging Schematics»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2)
3. «Power Distribution Schematics»(/cadillac/escalade/gmt900-2006-2014/remont/body-electrical/#wiring-systems-and-power-management-schematic-and-wiring-harness-routing-diagrams)
4. «Ground Distribution Schematics»(/cadillac/escalade/gmt900-2006-2014/remont/body-electrical/#wiring-systems-and-power-management-schematic-and-wiring-harness-routing-diagrams)

Connector End View Reference

Component Connector End Views

Description and Operation

1. «Immobilizer Description and Operation»(/cadillac/escalade/gmt900-2006-2014/remont/door-locks-anti-theft-systems/#immobilizer-system__immobilizer-description-and-operation)
2. «Charging System Description and Operation»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2)

Electrical Information Reference

1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Engine running, accessories OFF, measure and record the battery voltage at the 12V battery terminals. The voltage should be between 12.6 and 15.0 volts. If not within the specified range, refer to «Charging System Test»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2__charging-system-test) .
2. Ignition OFF, disconnect the harness connector at the TDM. Refer to «Theft Deterrent Module Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/door-locks-anti-theft-systems/#immobilizer-system) .
3. Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. 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 12V B+ circuit terminal 1 and ground. If the test lamp does not illuminate, test the 12V B+ circuit for a short to ground or an open/high resistance.
5. If all circuits test normal, replace the TDM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for TDM replacement, set up, and programming.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Typical Scan Tool Data

Battery Current - BCM

Battery Voltage - BCM

The battery current sensor is a 3 wire hall effect current sensor. The battery current sensor monitors the battery current. The signal circuit is an input to the body control module (BCM). The sensor creates a 5 volt pulse width modulation (PWM) signal of 128 Hz with a duty cycle of 0-100 percent. Normal duty cycle is between 4-96 percent. The signal circuit is an input to the body control module (BCM). If the duty cycle is outside of the normal range, DTC B1516 08 sets. The BCM also tests for correct polarity of the sensor. If the BCM detects positive current flow with the engine OFF, DTC B1516 66 sets.

B1516 08

The BCM is awake.

B1516 66

1. The BCM is awake.
2. The engine is OFF.
3. The hood and doors are closed.
4. DTC B1516 08 has run and passed during this ignition cycle.
5. DTC B1516 66 has not already run and passed during this ignition cycle.

B1516 08

The BCM detects the PWM duty cycle on the sensor signal circuit is less than 4 percent or greater than 96 percent for 2 minutes.

B1516 66

The BCM detects positive battery current when the engine is OFF.

Regulated voltage control (RVC) is disabled.

1. The DTC passes when the 12V battery sensed current returns to normal range for 15 seconds.
2. A history DTC will clear after 100 ignition cycles.

Schematic Reference

1. «Starting and Charging Schematics»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2)
2. «Body Control System Schematics»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#data-communication-system)

Connector End View Reference

Component Connector End Views

Description and Operation

Charging System Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition ON, headlamps and all accessories OFF, observe the scan tool BCM Battery Current parameter. The reading should be between -5 amps and -25 amps, and change with the amount of current draw on the battery.

1. Ignition ON, observe the scan tool BCM Battery Voltage parameter. The reading should be equal to B+ voltage. If not the specified value, test the following BCM circuits for an open/high resistance. If the circuits test normal, replace the BCM. B+ circuit terminal 3 X3 Ground circuit terminal 1 X3 Ground circuit terminal 5 X3 Ground circuit terminal 9 X4
2. Verify that the current sensor is mounted correctly on the 12V battery cable. The sensor should be installed with the internal coil around the negative battery cables, with the tape tab pointing away from the battery. If the sensor is not installed correctly, remove and reinstall the sensor.
3. Ignition OFF, disconnect the harness connector at the battery current sensor.
4. Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 ohms between the low reference circuit terminal B and ground. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the BCM.
5. Ignition ON, test for 4.5-5.5 volts between the 5-volt reference circuit terminal A and ground. If not within the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
6. Ignition ON, test for 4.5-5.5 volts between the signal circuit terminal C and ground. If not within the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
7. If all circuits test normal, replace the battery current sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Battery Current Sensor Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2)
2. «Control Module References»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Battery Voltage - BCM

Batt. Voltage High Res. - BCM

The body control module (BCM) has 2 circuits for monitoring vehicle 12V system voltage. The BCM B+ is supplied to terminal 3 X3 by the BCM fuse, and the high resolution B+ is supplied to the BCM terminal 10 X4 by the IPC fuse. The BCM monitors the system voltage on both circuits to ensure that the voltage stays within the proper range. Damage to components, and incorrect data may occur when the voltage is out of range. If the BCM detects the system voltage on the high resolution B+ circuit is outside the normal range, DTC B1517 will set.

The BCM is awake.

B1517 03

The voltage of the high resolution B+ circuit is less than 11 volts for 2 minutes.

B1517 07

The voltage of the high resolution B+ circuit is greater than 16 volts for 15 seconds.

B1517 5A

The voltage of the high resolution B+ circuit is 2 volts less than the voltage of the BCM B+ circuit for 10 seconds.

1. The instrument panel cluster (IPC) illuminates the charge indicator.
2. The driver information center (DIC) displays the SERVICE BATTERY CHARGING SYSTEM message.

1. The DTC will pass when the battery voltage is in the normal range for 15 seconds.
2. A history DTC will clear after 50 consecutive ignition cycles have occurred without a malfunction.
3. The charge indicator and DIC message will remain ON until the DTC is cleared.

1. A high or low voltage DTC in multiple modules indicates a concern in the 12V charging system.
2. Verify that the ground connections G103 and G201 are clean and tight.

Schematic Reference

1. «Body Control System Schematics»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#data-communication-system)
2. «Power Distribution Schematics»(/cadillac/escalade/gmt900-2006-2014/remont/body-electrical/#wiring-systems-and-power-management-schematic-and-wiring-harness-routing-diagrams)
3. «Ground Distribution Schematics»(/cadillac/escalade/gmt900-2006-2014/remont/body-electrical/#wiring-systems-and-power-management-schematic-and-wiring-harness-routing-diagrams)

Connector End View Reference

Component Connector End Views

Description and Operation

Charging System Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Engine running, accessories OFF, measure and record the battery voltage at the 12V battery terminals. The voltage should be between 12.6 and 15.0 volts. If not within the specified range, refer to «Charging System Test»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2__charging-system-test) .
2. Observe the scan tool BCM Battery Voltage parameter and the Batt. Voltage High Res. parameter. Both readings should be between 12.60 and 15.00 volts.

1. Ignition OFF, disconnect the harness connectors at the BCM.
2. Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 ohms between the following ground circuit terminals and ground: Terminal 1 X3 Terminal 5 X3 Terminal 9 X4 If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify that a test lamp illuminates between the following 12V B+ circuit terminals and ground: BCM B+ terminal 3 X3 High resolution B+ terminal 10 X4 If the test lamp does not illuminate, test the appropriate 12V B+ circuit for a short to ground or an open/high resistance.
4. If all circuits test normal, replace the BCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for BCM replacement, setup, and programming.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The body control module (BCM) monitors the state of charge (SOC) of the 12V electrical system. If the BCM senses that the 12V current draw was greater than 2 amps and the SOC at key-on is 30 percent lower than it was when the engine was last running, DTC B1527 00 will set.

The ignition is turned from Off to Accessory or Run.

1. The SOC at key-on is 30 percent lower than when the engine was last running.
2. The 12V battery drain is greater than 2 amps.

No actions are taken. This DTC sets as an aid to the technician.

1. The DTC will clear when the SOC is greater than or equal to 80 percent.
2. A history DTC clears after 50 consecutive ignition cycles that the diagnostic runs and does not fail.

Schematic Reference

Starting and Charging Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Charging System Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, compare the scan tool BCM Prev. State of Charge and Start Up State of Charge parameters. The scan tool readings should not differ by greater than 30 percent.

1. If the readings differ by greater than 30 percent, refer to «Battery Electrical Drain/Parasitic Load Test»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2) .

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Battery Voltage - PSCM

The power steering control module (PSCM) monitors the 12V system voltage to make sure that the voltage stays within the proper range. Damage to components, and incorrect data input can occur when the voltage is out of range. The PSCM monitors the system voltage. If the PSCM detects a 12V system voltage outside an expected range, DTC C0800 will set.

C0800 03

1. Ignition is in RUN.
2. The system relay is commanded ON.

C0800 07

1. Ignition is in RUN.
2. The vehicle speed is greater than 8 km/h (5 mph).

C0800 03

1. During initialization or when the system is inactive, the 12V system voltage is less than 10.5 volts.
2. During the system operation, the 12V system voltage is less than 9 volts.

C0800 07

1. Ignition is in RUN.
2. The system voltage is greater than 18.5 volts.

1. The driver information center (DIC) displays the SERVICE POWER STEERING warning message.
2. The PSCM disables steering assist.

1. The condition for the DTC is no longer present.
2. The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

C0800 03

1. A low voltage DTC in multiple modules indicates a concern in the charging system. Refer to «DC Power Conversion Test»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-symptom-troubleshooting-diagnosis) .
2. Possible causes of this DTC are the following conditions: A charging system malfunction An excessive battery draw A weak battery A poor system ground An open or high resistance in a circuit An internal module malfunction

C0800 07

1. Test the charging system. Refer to «DC Power Conversion Test»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-symptom-troubleshooting-diagnosis) .
2. Possible causes of this DTC are overcharging or jump starting.

Schematic Reference

1. «Power Steering Schematics»(/cadillac/escalade/gmt900-2006-2014/remont/electronic-steering/#power-steering-system)
2. «Starting and Charging Schematics»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2)
3. «Power Distribution Schematics»(/cadillac/escalade/gmt900-2006-2014/remont/body-electrical/#wiring-systems-and-power-management-schematic-and-wiring-harness-routing-diagrams)
4. «Ground Distribution Schematics»(/cadillac/escalade/gmt900-2006-2014/remont/body-electrical/#wiring-systems-and-power-management-schematic-and-wiring-harness-routing-diagrams)

Connector End View Reference

Component Connector End Views

Description and Operation

1. «Power Steering System Description and Operation (Hydraulic Power Steering)»(/cadillac/escalade/gmt900-2006-2014/remont/electronic-steering/#power-steering-system) or «Power Steering System Description and Operation (EPS)»(/cadillac/escalade/gmt900-2006-2014/remont/electronic-steering/#power-steering-system)
2. «Charging System Description and Operation»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2)

Electrical Information Reference

1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Engine running, accessories OFF, measure and record the battery voltage at the 12V battery terminals. The voltage should be between 12.6 and 15.0 volts. If not within the specified range, refer to «Charging System Test»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2__charging-system-test) .
2. Observe the scan tool PSCM Battery Voltage parameter. The reading should be between 12.60 and 15.00 volts.

1. Ignition OFF, disconnect the harness connectors at the PSCM.
2. Verify that a test lamp illuminates between the 12V B+ circuit terminal 5 X2 and ground. If the test lamp does not illuminate, test the 12V B+ circuit for a short to ground or an open/high resistance.
3. If all circuits test normal, replace the PSCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for PSCM replacement, setup, and programming.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Battery Voltage Signal - ESC Module

Twelve volts is supplied to the electronic suspension control (ESC) module by the battery positive (B+) voltage circuit. The ESC module monitors the supplied voltage to determine if it is within a valid operating range. Damage to components, and incorrect data may occur if the voltage is out of range. The ESC module disables all outputs, and sets DTC C0895 00, if high or low 12V battery voltage is detected.

The ignition is ON.

12V battery voltage is outside the normal range of 9.0-15.5 volts.

The ESC module disables all functionality.

1. A current DTC will clear when the voltage returns to the normal range.
2. A history DTC will clear if the condition does not return after 50 consecutive ignition cycles.

1. A high or low voltage value in multiple modules indicates a concern in the charging system.
2. Overcharging with a battery charger or jump starting can cause this DTC to set.

Schematic Reference

1. «Electronic Suspension Control Schematics»(/cadillac/escalade/gmt900-2006-2014/remont/electronic-suspension/#suspension-control-system-suspension-damping)
2. «Power Distribution Schematics»(/cadillac/escalade/gmt900-2006-2014/remont/body-electrical/#wiring-systems-and-power-management-schematic-and-wiring-harness-routing-diagrams)
3. «Ground Distribution Schematics»(/cadillac/escalade/gmt900-2006-2014/remont/body-electrical/#wiring-systems-and-power-management-schematic-and-wiring-harness-routing-diagrams)

Connector End View Reference

Component Connector End Views

Description and Operation

1. «Electronic Suspension Control Description and Operation»(/cadillac/escalade/gmt900-2006-2014/remont/electronic-suspension/#suspension-control-system-suspension-damping)
2. «Charging System Description and Operation»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2)

Electrical Information Reference

1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Engine running, accessories OFF, measure and record the battery voltage at the 12V battery terminals. The voltage should be between 12.6 and 15.0 volts. If not within the specified range, refer to «Charging System Test»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2__charging-system-test) .
2. Observe the scan tool ESC module Battery Voltage Signal parameter. The reading should be between 12.6 and 15.0 volts.

1. Ignition OFF, disconnect the harness connector of the ESC module.
2. Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 ohms between the ground circuit terminal 47 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 12V B+ circuit terminal 32 of the ESC module and ground. If the test lamp does not illuminate, test the 12V B+ circuit for a short to ground or an open/high resistance.
4. If all circuits test normal, replace the ESC module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ESC module replacement, setup and programming.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

42V Circuit Voltage - APM

42V Maximum Voltage - APM

Intermediate Voltage - PSCM

The accessory DC power control module (APM) supplies 42 volts to the power steering control module (PSCM). The PSCM monitors the supplied intermediate voltage to determine if it is within a valid operating range. Damage to components, and incorrect data may occur if the voltage is out of range. The PSCM disables power assist and sets DTC C0895 if high or low intermediate voltage is detected.

The ignition is ON.

C0895 03

Intermediate voltage is less than 40 volts.

C0895 07

Intermediate voltage is greater than 60 volts.

C0895 12

Intermediate voltage is less than 26 volts.

1. The driver information center (DIC) displays the SERVICE POWER STEERING warning message.
2. The PSCM limits the amount of steering assist if DTC C0895 03 is set.
3. The PSCM disables steering assist if DTC C0895 07 or 12 is set.

1. The DTC will pass when the intermediate voltage returns to the normal range.
2. A history DTC will clear if the condition does not return after 100 consecutive ignition cycles.

1. DTC C0895 will set if the APM has disabled the 42-volt conversion for any reason, such as a drive motor DTC. Diagnose any DTCs in the APM that disable the 42-volt circuit before diagnosing DTC C0895.
2. DTC C0895 may set if the engine stalls. Diagnose any engine stall DTCs in the ECM before diagnosing DTC C0895.
3. DTC C0895 may set if the serial data is interrupted. Verify that all modules can communicate, and diagnose any U-codes before diagnosing DTC C0895.
4. The APM may disable the 42-volt conversion if the 12-volt battery has low voltage. The PSCM will set DTC C0895 as a result. Verify that the 12-volt battery is fully charged before diagnosing DTC C0895.
5. If there is low voltage on the 42-volt circuit only when turning the steering wheel, the power steering motor is drawing too much current. This condition may set DTC C0895.
6. As the front wheels roll over bumps while driving, the power steering motor will generate voltage spikes on the 42V circuit. The PSCM contains a zener diode, to suppress any voltage spikes greater than 50 volts. The scan tool PSCM Intermediate Voltage parameter does not update fast enough to view most voltage spikes. The scan tool APM 42V Circuit Maximum parameter will record and display the maximum voltage on the 42V circuit during the current ignition cycle, including the voltage spikes caused by bump-steer. If the scan tool APM 42V Circuit Maximum parameter is greater than 50 volts after driving on a bumpy road, then the diode in the PSCM is open. This condition may set DTC C0895.
7. When testing for voltage at the APM 42V connector X2, use care not to cause a short between the 42V+ terminal 2 and the grounded shield which surrounds it. Use only the approved terminal probe, with the heat-shrink insulation in good condition, and only connect or disconnect the terminal probe when the 42-volt circuit is OFF. Test the terminals on the APM itself, not the harness. Do not touch the DMM or test leads while the ignition is ON.

Schematic Reference

Power Steering Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

1. «Power Steering System Description and Operation (Hydraulic Power Steering)»(/cadillac/escalade/gmt900-2006-2014/remont/electronic-steering/#power-steering-system) or «Power Steering System Description and Operation (EPS)»(/cadillac/escalade/gmt900-2006-2014/remont/electronic-steering/#power-steering-system)
2. «Charging System Description and Operation»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2)

Electrical Information Reference

1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-48900 HEV Safety Kit. See Special Tools .

1. Verify that there are no DTCs in the APM that disable the 42-volt circuit, no engine-stall DTCs in the ECM, and no U-codes in any module. If there are any of the specified DTCs, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
2. Engine running, accessories OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12.6-15.0 volts. If not within the specified range, refer to «Charging System Test»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2__charging-system-test) .
3. Engine running, observe the scan tool PSCM Intermediate Voltage parameter. The voltage should be 37.5-50 volts. If not within the specified range, refer to Voltage Out Of Range At All Times.
4. Engine running, rotate the steering wheel left and right while stationary. Observe the scan tool PSCM Intermediate Voltage parameter. The voltage should remain greater than 37.5 volts. If the voltage is less than the specified range only when turning the steering wheel, refer to Low Voltage When Turning.
5. Operate the vehicle on a bumpy road. Observe the scan tool APM 42V Circuit Maximum parameter. The scan tool 42V Circuit Maximum parameter should be less than 50 volts. If the voltage is greater than the specified range, replace the PSCM.

Voltage Out Of Range At All Times

1. Ignition OFF, disconnect the 42V harness connector X2 at the APM.
2. Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 3 ohms between the ground circuit terminal 1 X2 of the APM and ground. If greater than the specified range, test the APM ground circuits for an open/high resistance. If the circuits test normal, replace the APM.
3. Ignition OFF, connect a DMM between the 42V+ circuit terminal 2 X2 of the APM and ground.
4. Ignition ON, command the APM Intermediate Voltage Control ON with a scan tool. Test for 37.5-60 volts between the 42V+ circuit terminal 2 X2 terminal and ground. Command the APM Intermediate Voltage Control OFF after completing this test. If not within the specified range, replace the APM.
5. Ignition OFF, verify that the 42V harness connector X2 is connected under the PSCM. If the connector is not connected, connect the connector.
6. If all circuits test normal, replace the PSCM.

Low Voltage When Turning

1. Inspect the steering system for mechanical binding. The steering should have a heavy feel, if the power steering is disabled, but should not bind. If there is any mechanical binding in the steering system, refer to «Steering Effort Hard in One or Both Directions (HP2)»(/cadillac/escalade/gmt900-2006-2014/remont/electronic-steering/#power-steering-system__steering-effort-hard-in-one-or) .
2. If all circuits test normal, replace the power steering motor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Power Steering Assist Motor Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/electronic-steering/#power-steering-system)
2. «Control Module References»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for APM or PSCM replacement, setup and programming

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Battery Voltage Signal - EBCM

The electronic brake control module (EBCM) monitors the 12 V system voltage to make sure that the voltage stays within the proper range. Damage to components, and incorrect data input can occur when the voltage is out of range.

The ignition is ON.

The 12 V battery voltage available to the EBCM is less than 9 V for 100 msec.

1. The traction control system (TCS) and vehicle stability enhancement system (VSES) are disabled for the duration of the ignition cycle.
2. The EBCM requests the MIL to be turned ON.
3. The BRAKE indicator turns ON.
4. The antilock brake system (ABS) indicator turns ON.
5. The vehicle dynamics caution (VDC) indicator turns ON.
6. The driver information center (DIC) displays the SERVICE TRACTION CONTROL message.
7. The DIC displays the SERVICE STABILITRAK message.
8. The DIC displays the SERVICE BRAKES SOON message.
9. The ECM sets DTC C12E1 00.

1. The DTC will pass when the battery voltage is greater than 9.5 V for 100 msec.
2. The EBCM automatically clears a history DTC when a current DTC is not detected in 100 consecutive drive cycles.
3. The indicators and DIC messages turn OFF when the DTC is cleared, or on the next malfunction-free ignition cycle.

A low voltage DTC in multiple modules indicates a concern in the charging system. Refer to DC Power Conversion Test .

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Engine running, accessories OFF, measure and record the battery voltage at the 12 V battery terminals. The voltage should be between 12.6-15.0 V. If not within the specified range, refer to «Charging System Test»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2__charging-system-test) .
2. Observe the scan tool EBCM Battery Voltage Signal parameter. The reading should be between 12.6-15.0 Volts.

1. Ignition OFF, disconnect the harness connector at the EBCM.
2. Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 ohms between the ground circuit terminal 38 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 12 V B+ circuit terminal 25 and ground. If the test lamp does not illuminate, test the 12 V B+ circuit for a short to ground or an open/high resistance.
4. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 14 and ground. If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
5. If all circuits test normal, replace the EBCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM replacement, setup, and programming.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Battery Voltage Signal - EBCM

The electronic brake control module (EBCM) monitors the 12 V battery positive (B+) voltage. If the voltage level is too high, damage may result in the system. When a high voltage condition is detected the EBCM turns OFF the system relay which removes 12 V battery voltage from the solenoid valves and pump motor, and DTC C0900 sets.

Ignition is ON.

The 12 V battery voltage is greater than 16 volts for 100 msec.

1. The traction control system (TCS) and vehicle stability enhancement system (VSES) are disabled for the duration of the ignition cycle.
2. The antilock brake system (ABS) is disabled if ignition voltage exceeds 19.5 V.
3. The stability system off and traction control off indicators turn ON.
4. The ABS indicator turns ON if voltage exceeds 19.5 V.

1. The DTC will pass when the battery voltage is less than 15.5 V for 100 msec.
2. The EBCM automatically clears a history DTC when a current DTC is not detected in 100 consecutive drive cycles.
3. The indicators and DIC messages turn OFF when the DTC is cleared, or on the next malfunction-free ignition cycle.

1. This DTC could be set by overcharging with a battery charger.
2. A high voltage DTC in multiple modules indicates a concern in the charging system.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Engine running, accessories OFF, measure and record the battery voltage at the 12 V battery terminals. The voltage should be between 12.6-15.0 V. If not within the specified range, refer to «Charging System Test»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2__charging-system-test) .
2. Observe the scan tool EBCM Battery Voltage parameter. The reading should be between 12.6-15.0 Volts. If greater than the specified range, replace the EBCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM replacement, setup, and programming.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Ignition 1 Signal - ECM

The engine control module (ECM) monitors the 12V battery positive (B+) voltage to ensure that the voltage stays within the proper range. Damage to components, and incorrect data may occur when the voltage is out of range. If the ECM detects low 12V battery voltage, then DTC P0562 will set.

1. The vehicle speed is greater than 8 km/h (5 mph).
2. The 12V system voltage is between 9.5-18 V.

The ECM detects a system voltage less than 10 V.

1. The ECM will command the charge indicator to be illuminated on the instrument panel cluster (IPC).
2. The ECM will not illuminate the malfunction indicator lamp (MIL).
3. The ECM will store conditions, which were present when the DTC set as Fail Records data only.

1. The ECM will command the message OFF after one trip in which the diagnostic test has been run and passed.
2. The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.

1. A low voltage DTC in multiple modules indicates a concern in the charging system.
2. Inspect the ground connection G103. Verify that the connection is clean and tight.

Schematic Reference

1. «Control Module References»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM schematics
2. «Starting and Charging Schematics»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2)
3. «Power Distribution Schematics»(/cadillac/escalade/gmt900-2006-2014/remont/body-electrical/#wiring-systems-and-power-management-schematic-and-wiring-harness-routing-diagrams)
4. «Ground Distribution Schematics»(/cadillac/escalade/gmt900-2006-2014/remont/body-electrical/#wiring-systems-and-power-management-schematic-and-wiring-harness-routing-diagrams)

Connector End View Reference

Component Connector End Views

Description and Operation

Charging System Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Engine running, accessories OFF, measure and record the battery voltage at the 12V battery terminals. The voltage should be between 12.6 and 15.0 V. If not within the specified range, refer to «Charging System Test»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2__charging-system-test) .
2. Observe the scan tool ECM Ignition 1 Signal parameter. The reading should be between 12.6 and 15.0 V.

1. Ignition OFF, disconnect the harness connectors at the ECM.
2. Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 ohms between the following ground circuit terminals and ground: Terminal 73 X1 Terminal 73 X2 If greater than the specified range, test the ground circuit for an open/high resistance.
3. Verify that a test lamp illuminates between the 12V B+ circuit terminal 20 X1 and ground. If the test lamp does not illuminate, test the 12V B+ circuit for a short to ground or an open/high resistance.
4. If all circuits test normal, replace the ECM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ECM replacement, setup, and programming.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Ignition 1 Signal - ECM

The engine control module (ECM) monitors the 12V system voltage to ensure that the voltage stays within the proper range. Damage to components, and incorrect data may occur when the voltage is out of range.

1. The vehicle speed is greater than 8 km/h (5 mph).
2. The 12V system voltage is between 9.5-18 V.

The ECM detects a 12V system voltage above 16 V.

1. The ECM will command the charge indicator to be illuminated on the instrument panel cluster (IPC).
2. The ECM will not illuminate the malfunction indicator lamp (MIL).
3. The ECM will store conditions, which were present when the DTC set as Fail Records data only.

1. The ECM will command the indicator OFF after one trip in which the diagnostic test has been run and passed.
2. A history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.

1. This DTC could be set by overcharging with a battery charger.
2. A high voltage DTC in multiple modules indicates a concern in the charging system.

Schematic Reference

1. «Engine Controls Schematics»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-wiring-schematic-and-emission-hose-routing-diagrams)
2. «Starting and Charging Schematics»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2)
3. «Power Distribution Schematics»(/cadillac/escalade/gmt900-2006-2014/remont/body-electrical/#wiring-systems-and-power-management-schematic-and-wiring-harness-routing-diagrams)
4. «Ground Distribution Schematics»(/cadillac/escalade/gmt900-2006-2014/remont/body-electrical/#wiring-systems-and-power-management-schematic-and-wiring-harness-routing-diagrams)

Connector End View Reference

Component Connector End Views

Description and Operation

Charging System Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Engine running, accessories OFF, measure and record the battery voltage at the 12V battery terminals. The voltage should be between 12.6 and 15.0 V. If not within the specified range, refer to «Charging System Test»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2__charging-system-test) .
2. Observe the scan tool ECM Ignition 1 Signal parameter. The reading should be between 12.6 and 15.0 V. If greater than the specified range, replace the ECM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ECM replacement, setup, and programming.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

HPCM 300V Circuit - APM

High Battery Voltage - ACCM

The air conditioner control module (ACCM) monitors the high voltage direct current (HVDC) voltage to ensure that the voltage stays within the proper range. Damage to components, and incorrect data may occur when the voltage is out of range. If the ACCM detects low HVDC voltage, then DTC P0AFA will set.

1. The engine is running or is in autostop mode.
2. The 12V system voltage is between 9.5-18 V.

The ACCM detects that the hybrid battery voltage is less than 191 volts for 3 seconds.

The air conditioning is disabled.

1. The DTC will pass when the ACCM detects a hybrid battery voltage greater than 201 V for 3 seconds.
2. A history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.

Schematic Reference

1. «HVAC Schematics»(/cadillac/escalade/gmt900-2006-2014/remont/automatic-hvac-system/#hvac-system-automatic)
2. «Hybrid Controls Schematics»(/cadillac/escalade/gmt900-2006-2014/remont/body-electrical/#hybrid-engine-controls-wiring-schematics)

Connector End View Reference

Component Connector End Views

Description and Operation

1. «Heating and Air Conditioning System Description and Operation (HP2)»(/cadillac/escalade/gmt900-2006-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning)
2. «High Voltage Monitoring Systems Description»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-description-and-operation__high-voltage-monitoring-systems-description)

Electrical Information Reference

1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-48900 HEV Safety Kit. See Special Tools .

1. Verify that no hybrid powertrain control module (HPCM) or engine control module (ECM) DTCs are set that indicate generator, HPCM, or battery failure, or that disable the high voltage. If the specified DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
2. Engine running or autostop, observe the scan tool accessory DC power control module (APM) HPCM 300V Circuit parameter. The reading should be between 225 V and 380 V. If not within the specified range, refer to «Jump Assist»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system) .
3. Ignition ON, observe the scan tool ACCM High Battery Voltage parameter. The reading should be between 225 V and 380 V.

1. Disable the high voltage, and remove the 3 phase cable cover. Refer to «High Voltage Disabling»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__high-voltage-disabling) .
2. Ignition OFF, verify that the air conditioner compressor HVDC terminal bolts are present and are torqued to specification. If the bolts are missing or are not tight, replace any damaged components, install and tighten the bolts.
3. If all circuits test normal, replace the ACCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ACCM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

HPCM 300V Circuit - APM

High Battery Voltage - ACCM

The air conditioner control module (ACCM) monitors the high voltage direct current (HVDC) voltage to ensure that the voltage stays within the proper range. Damage to components, and incorrect data may occur when the voltage is out of range. If the ACCM detects high HVDC voltage, then DTC P0AFB will set.

1. The engine is running or is in autostop mode.
2. The 12 V system voltage is between 9.5-18 V.

The ACCM detects that the hybrid battery voltage is greater than 415 V for 3 seconds.

The air conditioning is disabled.

1. The DTC will pass when the ACCM detects a hybrid battery voltage less than 405 V for 3 seconds.
2. A history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.

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

Schematic Reference

1. «HVAC Schematics»(/cadillac/escalade/gmt900-2006-2014/remont/automatic-hvac-system/#hvac-system-automatic)
2. «Hybrid Controls Schematics»(/cadillac/escalade/gmt900-2006-2014/remont/body-electrical/#hybrid-engine-controls-wiring-schematics)

Connector End View Reference

Component Connector End Views

Description and Operation

1. «Heating and Air Conditioning System Description and Operation (HP2)»(/cadillac/escalade/gmt900-2006-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning)
2. «High Voltage Monitoring Systems Description»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-description-and-operation__high-voltage-monitoring-systems-description)

Electrical Information Reference

1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Verify that no hybrid powertrain control module (HPCM) DTCs are set due to high battery voltage. If the specified DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
2. Engine running or autostop, observe the scan tool ACCM High Battery Voltage parameter. The reading should be between 225 V and 380 V. If greater than the specified range, replace the ACCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ACCM replacement, setup, and programming.

Symptoms - Engine Electrical

The following steps must be completed before using the symptom tables.

1. Perform «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) before using the Symptom Tables in order to verify that all of the following are true: The power modes are correct. The control modules can communicate via the serial data link. There are no DTCs set.
2. Review the system descriptions and operations in order to familiarize yourself with the system functions. Refer to one of the following system operations: «Battery Description and Operation»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2) «Charging System Description and Operation»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2) «Starting System Description and Operation»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2__starting-system-description-and-operation)

Visual/Physical Inspection

1. Inspect the high voltage system. Refer to «High Voltage System Inspection»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-repair-instructions) .
2. Inspect for aftermarket devices which could affect the operation of the 12 V charging system. Refer to «Checking Aftermarket Accessories»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__checking-aftermarket-accessories) .
3. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections .

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

1. «Battery Inspection/Test»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2)
2. «Battery Charging»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2)
3. «Battery Electrical Drain/Parasitic Load Test»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2)
4. «Battery Common Causes of Malfunction»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2)
5. «Charging System Test»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2__charging-system-test)

12-Volt Battery

The following procedure is for the 12-Volt battery only.

Note. The 12V battery test using the J 42000 Battery Tester requires correct connections to the battery terminals. A failure to obtain the correct connections during the test may result in a failed test on a good battery.

Follow these instructions in order to avoid an incorrect diagnosis because of connections

1. If testing the vehicle with the battery cables still connected, wiggle the J 42000 clips on the terminal. This may cut through any coating or through any oxidation that may be present on the terminal. Even new bolts contain a protective coating that may insulate or cause a resistance in the test circuit.
2. If the tester displays a REPLACE BATTERY or BAD CELL-REPLACE result for a battery tested in the vehicle with the battery cables connected, perform the following steps: Disconnect the negative battery cable. Disconnect the positive battery cable. NOTE: Always write the test code displayed by the tester on the repair order for any warranty purposes. The number is a unique code that describes the test data for a particular battery at a particular time. The test code may occasionally repeat when you retest the same battery. More often, each test will result in a different code. Use the test code from the second, or Out of Vehicle test. Follow the instructions for testing a removed battery. Replace the battery only if the second test shows a REPLACE BATTERY or BAD CELL-REPLACE result. Use the test code from the second test for any warranty purposes.

Schematic Reference

Starting and Charging Schematics

Special Tools

J 42000 Battery Tester

1. Inspect the 12V battery for a cracked, broken, or damaged case, which may be indicated by battery acid leakage. If there is any apparent damage, replace the battery.
2. Verify the cold cranking amperage (CCA), and reserve capacity (RC) and/or amp hour (AH) rating of the battery to the original battery or original equipment (OE) specification. Refer to «Battery Usage»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#battery-charging-system-and-starting-system__battery-usage) . If the 12V battery does not meet or exceed specifications, replace the battery.
3. Verify that the battery cables are clean and tight. If the battery cable(s) need to be cleaned, clean as required and connect the terminals. If the battery cable(s) are damaged, replace the cable(s).
4. Install the J 42000 and follow directions supplied by the tester. If the tester calls for charging the battery, refer to «Battery Charging»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#battery-charging-system-and-starting-system) .

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Battery Positive Cable Replacement (without TP2)»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Positive Cable Replacement (with TP2)»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#battery-charging-system-and-starting-system)
2. «Battery Negative Cable Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#battery-charging-system-and-starting-system)
3. «Battery Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#battery-charging-system-and-starting-system)

The following procedure is for the 12-volt battery only.

For information about charging the high voltage drive motor batteries, refer to Jump Assist Description and Operation .

J 42000 Battery Tester

1. For best results, use an automatic taper-rate battery charger with a voltage capability of 16 volts.
2. The charging area should be well ventilated.
3. Do not charge a battery that appears to be frozen. Allow the battery to warm to room temperature and test it using the J 42000 before charging.

Battery State of Charge

Note. Using voltage to determine the 12V batteries state of charge (SOC) is only accurate after the battery has been at rest for 24 hours. This is enough time for the acid in each cell to equalize. If the battery has been charged or discharged in the past 24 hours, the battery SOC will only be an estimate.

The maintenance-free batteries SOC is estimated by reading the voltage of the battery across the battery terminals. Because the voltage is affected by current flow into or out of the battery, the engine must be stopped and all electrical loads turned OFF, including parasitic loads, when checking the voltage. The voltage can also be affected if the battery has just been charged or discharged, so it is important to consider what has happened to the battery in the time just before testing. Use the following procedure to determine the batteries SOC

1. Be sure all electrical loads are turned OFF.
2. Determine whether the 12V battery has been used in a vehicle or charged within the past 12 hours. If the answer is no, the terminal voltage will be stabilized and no action is necessary before reading the voltage. Skip to step 3. If the answer is yes, terminal voltage will not be stabilized and you should wait 12 hours since the last time the battery was used.
3. Estimate the battery temperature by determining the average temperature to which the battery has been exposed for the past 12 hours.
4. Measure the battery voltage at the battery terminals. Refer to the following table to determine the SOC according to the estimated battery temperature

Use the SOC information as follows

1. A battery with a SOC that is below 65 percent must always be recharged before returning it to service or continuing storage.
2. A battery with a SOC that is 65 percent or greater is generally considered to be charged enough in order to be returned to normal service or in order to continue storage. However, if the 12V battery is being used in slow traffic or with short drive times, or if the temperature is very hot or very cold, the battery should be fully charged, to at least 90 percent, before returning it to service or continuing storage.

Charging Time Required

The time required to charge a 12V battery will vary depending upon the following factors

1. The battery charger capacity-The higher the charger amperage, the less time it will take to charge the battery.
2. The SOC of the 12V battery-A completely discharged battery requires more than twice as much charging time as a half charged battery. In a discharged battery with a voltage below 11 volts, the battery has a very high internal resistance and may only accept a very low current at first. Later, as the charging current causes the acid content to increase in the electrolyte, the charging current will increase. Extremely discharged batteries may not activate the reversed voltage protection in some chargers. Refer to the manufacturer's instructions for operating this circuitry.
3. The temperature of the battery-The colder the battery is, the more time it takes to recharge the battery. The charging current accepted by a cold battery is very low at first. As the battery warms, the charging current will increase.

Charging Procedure

Use the following procedure to charge the battery

1. Turn OFF the charger.
2. Ensure that all of the 12V battery terminal connections are clean and tight.
3. Connect the charger positive lead to the battery positive terminal on the battery.
4. Connect the negative charger lead to a solid engine ground in the engine compartment. If the negative battery cable is disconnected, connect directly to the battery.
5. Turn ON the charger and set to the highest setting for normal charging.
6. Inspect the battery every half hour after starting the battery charger. Charge the battery until the taper-rate charger indicates that the battery is fully charged. Estimate the battery temperature by feeling the side of the battery. If it feels hot to the touch or its temperature is over 45°C (125°F), discontinue charging and allow the battery to cool before resuming charging.
7. After charging, test the 12V battery. Refer to «Battery Inspection/Test»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#battery-charging-system-and-starting-system) .

12 V Battery

The following procedure is for the 12 V battery only.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Components most likely to cause a parasitic draw on the vehicle's battery are switches, relays, and control modules. After the ignition is turned OFF the control modules will begin to go to sleep (shut OFF). All control modules do not go to sleep at the same time, some may take up to 30 minutes or longer after turning the ignition off before going to sleep, like the HVAC and body control modules. Others such as the ON Star and keyless entry control modules may periodically wake up then go back to sleep. These are all normal conditions.

1. Rule out any possible aftermarket equipment causing an unacceptable parasitic current drain. Aftermarket accessories installed into the courtesy lamp circuit can cause the inadvertent power timer in the body control module (BCM) to keep resetting. This would cause the BCM to remain awake and cause a current drain on the battery.
2. Rule out customer driving habits such as regular short trips that do not allow enough time to properly charge the battery. Refer to «Battery Description and Operation»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#battery-charging-system-and-starting-system__battery-description-and-operation) .
3. Verify that the battery and charging system are in proper working order. Refer to «Battery Charging»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#battery-charging-system-and-starting-system) and «Charging System Test»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#battery-charging-system-and-starting-system) .
4. A battery discharging for no apparent reason while the vehicle is parked can be caused by an intermittent draw, such as a module waking up, or a continuous draw, such as a dome light or stuck relay.
5. Some systems and modules such as OnStar®, and regulated voltage control (RVC), if equipped, are designed to wake-up, perform a task, and go back asleep at regular intervals. Refer to «Body Control System Description and Operation»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#data-communication-system__body-control-system-description-and-operation) for the system or modules description and operation.
6. An engine off natural vacuum evaporative test can occur if the engine control module (ECM) determines the drive cycle has met the appropriate criteria immediately after key off. The ECM will stay awake and the vent solenoid will stay energized for as long as 45 minutes. The typical current draw for this is about 1 A.
7. Digital OnStar gen 6 and later VCIMs do not "wake up" every 10 minutes for the first 48 hours as the gen 5 and prior. Gen 6 and later VCIM current draw is very low, less than 40 mA, so the OnStar system is left in that state for up to the first 48 hours. Parasitic draw of up to 40 mA with an occasional spike as high as 80 mA through the VCIM for the first 48 hours is normal.
8. Some automatic climate control systems can remain in a semi-awake state for up to three hours, actual draw amounts vary by vehicle platform but are typically not greater than 50 mA.
9. An extremely low mA current level is consumed by the RKE receiver for monitoring purposes, actual system wake up only occurs when the fobs for the vehicle are used. When other devices on the same RKE operating frequency are activated, such as the 4 tire pressure monitoring sensors and other vehicle FOB's in the vicinity, the RKE receiver will have a 100 mA spike. These spikes are normal and occur too briefly to have a significant effect on battery drain. Competing signals may cause RKE performance issues such as jamming but should not cause excessive battery draw.
10. If an excessive current draw is not present during initial testing, continue periodic testing over a 1-2 hour period to see if the current draw increases and stays above an unacceptable level.
11. The battery run down time will vary depending on the batteries reserve capacity. If the reserve capacity is higher, then the battery run down time would be longer. If the reserve capacity is lower, then the battery run down time would be shorter. The graph below indicates roughly how many days a 690 cold cranking amp battery with a 110 min. reserve capacity starting at 80 percent state of charge will last with a constant current draw until it reaches 50 percent state of charge. Differences in battery reserve capacity and temperature will affect the results.

Schematic Reference

Control Module References

Connector End View Reference

Component Connector End Views

Electrical Information Reference

1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
3. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL 38758: Parasitic Draw Test Switch

For equivalent regional tools, refer to Special Tools .

Note. Most vehicle systems will go to sleep within 30 minutes but it can take up to 2 hours before all systems power down allowing the parasitic draw test to pass. An occasional increase in the parasitic draw is normal as long as it returns within 1 second. Closing the door latches/ajar switch while leaving the doors open is recommended, this allows the vehicle systems to perform in a "doors closed" mode while allowing vehicle interior access that may be needed to complete the diagnostic steps. Locking doors will arm the vehicle content theft deterrent system if equipped. Failure to arm the system may cause a theft system fault to not be present during testing. There are many things that can prevent the vehicle from completely going to sleep and passing the parasitic draw test. Make sure all the conditions listed below are met before performing the parasitic current draw test. Ignition OFF Key out of the ignition switch - when not equipped with keyless access and start Retained Accessory Power RAP OFF - open and close the driver door after ignition OFF Scan tool not communicating with a vehicle control module - in some cases it may need to be disconnected from the DLC All access doors closed Headlamps OFF - auto headlamps disabled Any delay lighting OFF If equipped with an under hood lamp disable it HVAC after blow OFF Any accessory that can work with ignition OFF inactive or OFF Wait up to 2 minutes or longer, after all other listed conditions are met

Using an Inductive Pickup Probe

1. Connect an inductive pickup probe to the negative battery cable that can read down to 1 mA.
2. Ignition OFF, as the vehicle systems shut down test for less than 30 mA of parasitic current drain. If greater than the specified range, refer to «Circuit/System Testing»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2) .

Using the EL 38758 Parasitic Draw Test Switch

1. Ignition OFF, disconnect the battery negative cable from the battery. Refer to «Battery Negative Cable Disconnection and Connection»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#battery-charging-system-and-starting-system) .
2. Turn the EL 38758: switch knob to the OFF position.
3. Install the male end of the EL 38758: switch to the battery ground terminal.
4. Install the battery negative cable to the female end of the EL 38758: switch.
5. Turn the EL 38758: switch knob to the ON position.
6. Road test the vehicle and activate all of the accessories such as the radio and air conditioning.
7. Ignition OFF, connect a 10 A fused jumper wire to the test switch tool terminals.
8. Turn the EL 38758: switch knob to the OFF position. The current now flows through the jumper wire.
9. Check the fuse in the jumper wire. The fuse should be OK. If the jumper wire fuse is blown, refer to «Circuit/System Testing»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2) .
10. Turn the EL 38758: switch knob to the ON position. Remove the fused jumper wire.
11. Connect a DMM set to the 10 A DC scale between the test switch tool terminals.
12. Turn the EL 38758: switch knob to the OFF position. The current now flows through the DMM.
13. As the vehicle systems shut down test for less than 30 mA of parasitic current drain. If greater than the specified range, refer to «Circuit/System Testing»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2) .

Note. Removing or installing a fuse, relay, or connector, to determine the area causing high parasitic draw may wake up control modules. You must wait for the control modules to go back to sleep before retesting. It is best to install any removed or disconnected components after the diagnosis is completed. Fuses for power mode master components such as the BCM should be removed last to avoid misdiagnosis. If a scan tool is connected to the DLC, either disconnect it or subtract the scan tool current draw from the DMM reading to get the actual vehicle parasitic current draw.

If the vehicle has an unacceptable amount of parasitic current draw, remove each fuse one at a time until the current draw falls to an acceptable level. A drop of more than 10-20 mA, when disabling a single system or circuit, is an indication of an overly high current draw that could be causing the battery drain. Refer to Power Distribution Schematics to diagnose exactly which circuit of the suspect system is causing the high parasitic drain. The follow is a list of common components that could cause a high current draw

1. Stuck switch
2. Stuck relay
3. Control module

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for control module replacement, programming and setup

The following information is for the 12-Volt battery only.

A battery is not designed to last forever. With proper care, however, the battery will provide years of good service. If the 12V battery tests good but still fails to perform well, the following are some of the more common causes

1. A vehicle accessory was left on overnight.
2. The driving speeds have been slow with frequent stops with many electrical accessories in use, particularly headlights, wipers, heated rear window, cellular telephone, etc.
3. The electrical load has exceeded the charging system output, particularly with the addition of aftermarket equipment.
4. Existing conditions in the 12V charging system.
5. The battery has not been properly maintained, including a loose battery hold down or missing battery insulator if used.
6. There are mechanical conditions in the electrical system, such as a short or a pinched wire, attributing to power failure. Refer to «General Electrical Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures) .

Electrolyte Freezing

The freezing point of electrolyte depends on its specific gravity. A fully charged 12V battery will not freeze until the ambient temperature gets below -54°C (-65°F). However, a battery with a low state of charge may freeze at temperatures as high as -7°C (+20°F). Since freezing may ruin a battery, the battery should be protected against freezing by keeping it properly charged. As long as the green eye is visible in the hydrometer, the freezing point of the battery will be somewhere below -32°C (-25°F).

Battery Protection During Vehicle Storage

Certain devices on the vehicle maintain a small continuous current drain on the battery. A battery that is not used for an extended period of time will discharge. Eventually permanent damage will result. Discharged batteries will also freeze in cold weather. Refer to Battery Inspection/Test .

In order to maintain a battery state of charge while storing the vehicle for more than 30 days, disconnect the battery ground to protect the battery from discharge by parasitic current drains.

When the battery cannot be disconnected

1. Maintain a high state of charge.
2. Establish a regular schedule for recharging the battery every 20-45 days.

A battery that has remained in a discharged state for a long period of time is difficult to recharge or may be permanently damaged.

Charging System Test

The accessory power module (APM) supplies the energy that flows between the high voltage (300 volt) direct current (DC) and low voltage (14 volt) DC to charge the 12 volt battery and power accessories. To test the charging system, refer to DC Power Conversion Test .

Disconnect Procedure

Note. Do NOT disconnect the negative battery cable from the battery until a period of at least 1 minute after performing the following: Turning the ignition to OFF, without pausing at ACCESSORY, and without applying the brake pedal. These steps are necessary to allow the brake system pressure relief procedure to occur. Failure to follow these steps may result in warning lamps and/or DTCs being set pertaining to interruption of the pressure relief procedure. Other vehicle systems may also be affected by not allowing a 1 minute duration for power-down.

1. Turn off all lamps and accessories.
2. Turn the ignition OFF without pausing at ACCESSORY, and remove the ignition key.
3. Wait for at least 1 minute before disconnecting the negative battery cable from the battery, to allow for proper power-down procedures of certain vehicle systems.
4. Reposition the negative battery cable insulating cover (5) from the negative battery terminal.
5. Rotate the lever lock (4) counterclockwise in order to disconnect the negative battery cable from the battery.

Connect Procedure

Note. Clean any existing corrosion from the battery terminal and the battery cable.

1. Install the negative battery cable (6) to the battery.
2. Rotate the lever lock (4) clockwise until an audible click is heard in order to connect the negative battery cable to the battery.
3. Position the negative battery cable insulating cover (5) over the negative terminal.

Removal Procedure

1. Remove the negative battery cable. Refer to «Battery Negative Cable Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2) .
2. Mark the location of the negative battery cable clip (1) and remove the clip from the cable.
3. Mark the location of the battery current sensor (2) on the battery cable with tape for reference during installation.
4. Remove the tape securing the battery current sensor to the negative battery cable.
5. Squeeze the negative battery cable branches together.
6. Slide the battery current sensor (2) off of the negative battery cable.

Installation Procedure

1. Squeeze the negative battery cable branches together.
2. Slide the NEW battery current sensor (2) up onto the negative battery cable to the location previously marked during removal.
3. Wrap electrical tape around the battery current sensor leg in order to secure the sensor to the negative battery cable.
4. Install the negative battery cable clip (1) to the cable to the location previously marked during removal.
5. Install the negative battery cable. Refer to «Battery Negative Cable Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2) .

1. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2) .
2. Disconnect the engine wiring harness electrical connector (1) from the battery current sensor (2).
3. Remove the negative battery cable clip (1) from the auxiliary bussed electrical center (BEC).
4. Remove the negative battery cable ground terminal bolt (1) from the left side engine block boss.
5. Remove the negative battery cable (3) and the engine wiring harness ground (2) leads from the engine block boss.
6. Raise and suitably support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
7. Remove the engine wiring harness ground lead bolt (1) from the frame.
8. Remove the engine wiring harness ground lead (2) and the negative battery cable lead (3) from the frame.
9. Lower the vehicle.
10. Remove the negative battery cable assembly (1) from under the positive battery cable and from the vehicle.

1. Install the negative battery cable assembly (1) to the vehicle and route the cable under the positive battery cable.
2. Raise and suitably support the vehicle.
3. Position the negative battery cable lead (3) behind the engine wiring harness ground lead (2).
4. Place the engine wiring harness ground lead (2) and the negative battery cable lead (3) to the frame.
5. Insert the anti-rotation tab on the engine harness ground lead into the hole in the frame.
6. Install the engine wiring harness ground lead to the frame bolt (1) and tighten to 9 N.m (80 lb in).
7. Lower the vehicle.
8. Position the engine wiring harness ground lead (2) behind the negative battery cable lead (3).
9. Place the negative battery cable lead (3) and the engine wiring harness ground lead (2) against the engine block boss.
10. Install the negative battery cable ground terminal to the engine block boss bolt (1) and tighten to 50 N.m (37 lb ft).
11. Install the negative battery cable clip (1) to the auxiliary BEC.
12. Connect the engine wiring harness electrical connector (1) to the battery current sensor (2).
13. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2) .

1. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2) .
2. Reposition the positive battery cable insulating cover (2) from over the positive terminal.
3. Rotate the lever lock (1) counterclockwise in order to disconnect the positive battery cable.
4. Remove the positive battery cable terminal (3) from the battery.
5. Remove the auxiliary bussed electrical center (BEC) cover (1).
6. Remove the underhood junction block cover.
7. Lift the junction block retainers from the locked position (3) and rotate the retainers to the open position (1).
8. Remove the junction block.
9. Remove the positive battery cable nut (1) from the mega fuse stud.
10. Remove the positive battery cable nut (3) from the auxiliary BEC stud.
11. Disconnect the positive battery cable connector (2) from the underhood BEC.
12. Remove the positive battery cable assembly (1) from the vehicle.

1. Install the positive battery cable assembly (1) to the vehicle.
2. Install the positive battery cable leads to the mega fuse and auxiliary BEC studs.
3. Connect the positive battery cable connector (2) to the underhood BEC.
4. Install the positive battery cable nut (3) to the auxiliary BEC stud and tighten to 9 N.m (80 lb in).
5. Install the positive battery cable nut (1) to the mega fuse stud and tighten to 9 N.m (80 lb in).
6. Ensure that the junction block retainers are in the open position (1).
7. Position and align the junction block to the 4 bracket pivots (2), once the pivots are engaged, push the retainers down into the locked position (3).
8. Install the underhood junction block cover.
9. Install the auxiliary BEC cover (1).
10. Install the positive battery cable terminal (3) to the battery.
11. Rotate the lever lock (1) clockwise until an audible click is heard in order to connect the positive battery cable.
12. Position the positive battery cable insulating cover (2) over the positive terminal.
13. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2) .

1. Disable the high voltage system. Refer to «High Voltage Disabling»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__high-voltage-disabling) .
2. Remove the auxiliary bussed electrical center (BEC) cover (1).
3. Remove the positive battery cable nut (1) from the mega fuse stud.
4. Remove the positive battery cable lead (5) from the mega fuse stud.
5. Remove the engine shield. Refer to «Engine Shield Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) .
6. Remove the positive battery cable clips (2, 3, and 4) from the frame crossmember.
7. Lower the vehicle enough to remove the right wheelhouse panel. Refer to «Wheelhouse Panel Replacement - Right Side (HP2)»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) .
8. Working through the wheel opening, remove the positive battery cable clip (2) from the brake pipe.
9. Working through the wheel opening, remove the positive battery cable clip (3) from the air cleaner adapter bracket
10. Lower the vehicle.
11. Remove the air cleaner assembly. Refer to «Air Cleaner Assembly Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
12. Remove the positive battery cable clip (4) from the air cleaner support bracket.
13. Remove the positive battery cable clip (5) from the fender inner panel.
14. Disconnect the positive battery cable electrical connector (1) from the drive motor generator control module.
15. Remove the positive battery cable (1) from the vehicle.

1. Install the positive battery cable (1) to the vehicle.
2. Connect the positive battery cable electrical connector (1) to the drive motor generator control module.
3. Install the positive battery cable clip (5) to the fender inner panel.
4. Install the positive battery cable clip (4) to the air cleaner support bracket.
5. Install the air cleaner assembly. Refer to «Air Cleaner Assembly Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
6. Raise and suitably support the vehicle enough to work through the wheel opening.
7. Working through the wheel opening, install the positive battery cable clip (3) to air cleaner adapter bracket
8. Working through the wheel opening, install the positive battery cable clip (2) to the brake pipe.
9. Install the right wheelhouse panel. Refer to «Wheelhouse Panel Replacement - Right Side (HP2)»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) .
10. Fully raise the vehicle.
11. Install the positive battery cable clips (2, 3, and 4) to the frame crossmember.
12. Install the engine shield. Refer to «Engine Shield Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) .
13. Lower the vehicle.
14. Install the positive battery cable lead (5) to the mega fuse stud.
15. Install the positive battery cable nut (1) to the mega fuse stud and tighten to 9 N.m (80 lb in).
16. Install the auxiliary BEC cover (1).
17. Enable the high voltage system. Refer to «High Voltage Enabling»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__high-voltage-enabling) .

1. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2) .
2. Remove the radiator support diagonal brace. Refer to «Radiator Support Diagonal Brace Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/exterior-body-panels/#bolted-exterior-body-panels-and-closures) .
3. Reposition the positive battery cable insulating cover (2) from over the positive terminal.
4. Rotate the lever lock (1) counterclockwise in order to disconnect the positive battery cable.
5. Remove the positive battery cable terminal (3) from the battery.
6. Remove the battery hold down bolt (1) and hold down (3).
7. Remove the battery assembly (2).

1. Install the battery assembly (2).
2. Install the battery hold down (3) and bolt (1) and tighten to 25 N.m (18 lb ft).
3. Install the positive battery cable terminal (3) to the battery.
4. Rotate the lever lock (1) clockwise until an audible click is heard in order to connect the positive battery cable.
5. Position the positive battery cable insulating cover (2) over the positive terminal.
6. Install the radiator support diagonal brace. Refer to «Radiator Support Diagonal Brace Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/exterior-body-panels/#bolted-exterior-body-panels-and-closures) .
7. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2) .

1. Remove the battery. Refer to «Battery Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2) .
2. Reposition the positive and negative battery cables out of the way.
3. Remove the battery tray to battery tray reinforcement bolts (1).
4. Remove the battery tray to battery tray support bolts (2).
5. Remove the battery tray to auxiliary bussed electrical center (BEC) bolt (4).
6. Remove the battery tray (3).

1. Install the battery tray (3) into the vehicle.
2. Install the battery tray to battery tray reinforcement bolts (1) and tighten to 9 N.m (80 lb in).
3. Install the battery tray support bolts (2) and tighten to 9 N.m (80 lb in).
4. Install the battery tray to auxiliary BEC bolt (4) and tighten to 9 N.m (80 lb in).
5. Install the positive and negative battery cables.
6. Install the battery. Refer to «Battery Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2) .

1. Remove the engine wiring harness ground bolt.
2. Reposition the engine wiring harness ground and ground strap.
3. Remove the ground strap nut from the stud at the front of dash.
4. Remove the ground strap from the stud.

1. Install the ground strap to the stud.
2. Install the ground strap nut to the stud at the front of dash and tighten to 9 N.m (80 lb in).
3. Position the ground strap and engine wiring harness ground.
4. Install the engine wiring harness ground bolt and tighten to 16 N.m (12 lb ft).

Generator Control Module Ground Strap Replacement

1. Remove the air cleaner assembly. Refer to «Upper Intake Manifold Cover Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/mechanical/#engine-mechanical-hybrid-hp2-60l-lz1) .
2. Remove the drive motor generator control module ground strap bolt (1) and strap (2).

1. Position the ground strap (2) to the drive motor generator control module.
2. Install the ground strap bolt (1) and tighten to 9 N.m (80 lb in).
3. Install the air cleaner assembly. Refer to «Upper Intake Manifold Cover Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/mechanical/#engine-mechanical-hybrid-hp2-60l-lz1) .

300-Volt Battery

For information about the 300V hybrid drive motor battery, refer to Drive Motor Battery System Description .

Scheme 9

Note. Because of the materials used in the manufacture of automotive lead-acid batteries, dealers and service shops that handle them are subject to various regulations issued by OSHA, EPA, DOT, and various state or local agencies. Other regulations may also apply in other locations. Always know and follow these regulations when handling batteries.

Batteries that are no longer wanted must be disposed of by an approved battery recycler and must never be thrown in the trash or sent to a landfill.

Batteries that are not part of the vehicle itself, not the battery under the hood, must only be transported on public streets for business purposes via approved hazardous material transportation procedures.

Battery storage, charging, and testing facilities in repair shops must meet various requirements for ventilation, safety equipment, material segregation, etc.

The maintenance-free battery is standard. There are no vent plugs in the cover. The battery is completely sealed except for 2 small vent holes in the side. These vent holes allow the small amount of gas that is produced in the battery to escape.

The battery specification label, example below, contains information about the following

1. The test ratings
2. The original equipment catalog number
3. The recommended replacement model number

Scheme 10

Battery Ratings

A battery may have 3 ratings

1. Amp hour (AH)
2. Reserve capacity (RC)
3. Cold cranking amperage (CCA)

When a battery is replaced, use a battery with similar ratings. Refer to the battery specification label on the original battery or refer to Battery Usage .

Amp Hour (AH)

The amp hour rating of a battery is the amount of time it takes a fully charged battery, being discharged at a constant rate of 1 amperes and a constant temperature of 27°C (80°F), to reach a terminal voltage of 10.5 volts. Refer to Battery Usage for the amp hour rating of the original equipment battery.

Reserve Capacity (RC)

Reserve capacity is the amount of time in minutes it takes a fully charged battery, being discharged at a constant rate of 25 amperes and a constant temperature of 27°C (80°F), to reach a terminal voltage of 10.5 volts. Refer to Battery Usage for the reserve capacity rating of the original equipment battery.

Cold Cranking Amperage (CCA)

The cold cranking amperage is an indication of the ability of the battery to crank the engine at cold temperatures. The cold cranking amperage rating is the minimum amperage the battery must maintain for 30 seconds at -18°C (0°F) while maintaining at least 7.2 volts. Refer to Battery Usage for the cold cranking amperage rating for this vehicle.

The following information is for the 12-Volt battery only.

For information about charging the high voltage drive motor batteries, refer to Jump Assist Description and Operation .

Electrical Power Management (EPM) Overview

The electrical power management (EPM) system is designed to monitor and control the charging system and send diagnostic messages to alert the driver of possible problems. This EPM system primarily utilizes existing on-board computer capability to maximize the effectiveness of the charging system, manage the load, improve battery state-of-charge and life, and minimize the system's impact on fuel economy. The EPM system performs 3 functions

1. It monitors the battery voltage and estimates the battery condition.
2. It takes corrective actions by adjusting the regulated voltage.
3. It performs diagnostics and driver notification.

The battery condition is estimated during ignition off and during ignition on. During ignition off the state-of-charge (SOC) of the battery is determined by measuring the open-circuit voltage. The SOC is a function of the acid concentration and the internal resistance of the battery, and is estimated by reading the battery open circuit voltage when the battery has been at rest for several hours.

The SOC can be used as a diagnostic tool to tell the customer or the dealer the condition of the battery. Throughout ignition-on, the algorithm continuously estimates SOC based on adjusted net amp hours, battery capacity, initial SOC, and temperature.

While running, the battery degree of discharge is primarily determined by a battery current sensor, which is integrated to obtain net amp hours.

In addition, the EPM function is designed to perform regulated voltage control (RVC) to improve battery SOC, battery life, and fuel economy. This is accomplished by using knowledge of the battery SOC and temperature to set the charging voltage to an optimum battery voltage level for recharging without detriment to battery life.

Drive Motor/Generators

The drive motor/generators are serviceable components located within the transmission housing. When the rotors are spun, an alternating current (AC) is induced into the stator windings. This AC voltage is then sent to the drive motor generator power inverter module (PIM) where it is converted to high voltage direct current (DC) power. The output of the PIM is converted into low voltage electrical power by the accessory DC power converter module (APM) for use by the vehicle's electrical system to maintain electrical loads and battery charge.

Body Control Module (BCM)

The body control module (BCM) is a GMLAN device. It communicates with the engine control module (ECM) and the instrument panel cluster (IPC) for electrical power management (EPM) operation. The BCM determines the desired voltage set point and sends the information to the APM. The BCM monitors a battery current sensor, the battery positive voltage circuit, and estimated battery temperature to determine battery state of charge (SOC).

Battery Current Sensor

The battery current sensor is a serviceable component that is connected to the negative battery cable at the battery. The battery current sensor is a 3-wire hall effect current sensor. The battery current sensor monitors the battery current. It directly inputs to the BCM. It creates a 5-volt pulse width modulation (PWM) signal of 128 Hz with a duty cycle of 0-100 percent. Normal duty cycle is between 5-95 percent. Between 0-5 percent and 95-100 percent are for diagnostic purposes.

Engine Control Module (ECM)

The ECM receives control decisions based on messages from the BCM.

Instrument Panel Cluster (IPC)

The IPC provides a means of customer notification in case of a failure and a voltmeter. There are 2 means of notification, a charge indicator and a driver information center (DIC) message of SERVICE BATTERY CHARGING SYSTEM.

Charging System Operation

The purpose of the charging system is to maintain the battery charge and vehicle loads. There are 6 modes of operation and they include

1. Battery Sulfation Mode
2. Normal Mode
3. Fuel Economy Mode
4. Headlamp Mode
5. Voltage Reduction Mode
6. Plant Assembly Mode

Battery Sulfation Mode

The BCM will enter this mode when the interpreted charging system voltage is less than 13.2 volts for 30 minutes. When this condition exists the BCM will enter Normal Mode for 5 minutes. The BCM will then determine which mode to enter depending on voltage requirements.

Normal Mode

The BCM will enter Normal Mode when ever one of the following conditions are met.

1. The wipers are ON for more than 3 seconds.
2. GMLAN Climate Control Voltage Boost Mode Request is true, as sensed by the HVAC control head. High speed cooling fan, rear defogger and HVAC high speed blower operation can cause the BCM to enter the Charge Mode.
3. The estimated battery temperature is less than 0°C (32°F).
4. Vehicle Speed is greater than 145 km/h (90 mph)
5. Current Sensor Fault Exists
6. System Voltage was determined to be below 12.56 volts
7. Tow/Haul Mode is enabled

When any one of these conditions is met, the system will set targeted generator output voltage to a charging voltage between 13.9-15.5 volts, depending on the battery state of charge and estimated battery temperature.

Fuel Economy Mode

The BCM will enter Fuel Economy Mode when the ambient air temperature is at least 0°C (32°F) but less than or equal to 80°C (176°F), the calculated battery current is greater than -8 amps but less than 5 amps, and the battery state of charge (SOC) is greater than or equal to 85 percent. Its targeted APM set-point voltage is the open circuit voltage of the battery and can be between 12.6-13.2 volts. The BCM will exit this mode and enter Normal Mode when any of the conditions described above are present.

Headlamp Mode

The BCM will enter Headlamp Mode when ever the high or low beam headlamps are ON. Voltage will be regulated between 13.9-14.5 volts

Voltage Reduction Mode

The BCM will enter Voltage Reduction Mode when the calculated battery temperature is above 0°C (32°F) and the calculated battery current is greater than -7 amps but less than 1 amp. Its targeted APM set-point voltage is 12.9-13.2 volts. The BCM will exit this mode once the criteria are met for Normal Mode.

Plant Assembly Mode

The BCM will increase charging voltage for the first 500 miles of operation in an effort to ensure that the 12 volt battery is fully charged when the vehicle is delivered to the customer.

Charge Indicator Operation

The instrument panel cluster (IPC) illuminates the charge indicator and displays a warning message in the driver information center (DIC) when the one or more of the following occurs

1. The engine control module (ECM) detects system voltage less than 11 volts or greater than 16 volts. The IPC receives a GMLAN message from the ECM requesting illumination.
2. The BCM determines that the system voltage is less than 11 volts or greater than 16 volts.
3. The IPC receives a GMLAN message from the body control module (BCM) indicating there is a system voltage range concern.
4. The IPC performs the displays test at the start of each ignition cycle. The indicator illuminates for approximately 3 seconds.
5. The ignition is ON, with the engine OFF.

Battery Voltage Gauge Operation

The IPC displays the system voltage as received from the BCM over the GMLAN serial data circuit. If there is no communication with the BCM then the gauge will indicate minimum.

This vehicle is equipped with a regulated voltage control (RVC) system. This will cause the voltmeter to fluctuate between 12 and 14 volts, as opposed to non-regulated systems which usually maintain a more consistent reading of 14 volts. This fluctuation with the RVC system is normal system operation and NO repairs should be attempted.

SERVICE BATTERY CHARGING SYSTEM

The BCM and the ECM will send a GMLAN message to the DIC for the SERVICE BATTERY CHARGING SYSTEM message to be displayed. It is displayed whenever the charge indicator is commanded ON due to a failure.

Starting System Description and Operation

The HP2 hybrid system does not use a conventional starter. Refer to Hybrid Modes of Operation Description for information about the starting system.

Illustration Tool Number/Description J 38758 Parasitic Draw Test Switch J 42000 Battery Tester EL-48900 HEV Safety Kit

Scheme 11

Scheme 12

See also:
• Diagnostic System Check - Vehicle
• Strategy Based Diagnosis
• Diagnostic Procedure Instructions
• Diagnostic Trouble Code (DTC) List - Vehicle
• Control Module References
• Power Distribution Schematics
• Component Connector End Views
• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs
• Diagnostic Repair Verification
• Immobilizer Schematics
• Immobilizer Description and Operation
• Body Control System Schematics
• DC Power Conversion Test
• Power Steering Schematics
• Electronic Suspension Control Schematics
• Steering Effort Hard in One or Both Directions (HP2)
• Antilock Brake System Schematics
• ABS Description and Operation
• Engine Controls Schematics
• HVAC Schematics
• Hybrid Controls Schematics
• Heating and Air Conditioning System Description and Operation (HP2)
• High Voltage Monitoring Systems Description
• Jump Assist
• High Voltage Disabling
• High Voltage System Inspection
• Checking Aftermarket Accessories
• Battery Disconnect Warning
• Battery Usage
• Battery Charging
• Battery Description and Operation
• Body Control System Description and Operation
• General Electrical Diagnosis
• Lifting and Jacking the Vehicle
• Fastener Caution
• Engine Shield Replacement
• Air Cleaner Assembly Replacement
• High Voltage Enabling
• Radiator Support Diagonal Brace Replacement
• Upper Intake Manifold Cover Replacement
• Hybrid Modes of Operation Description
• DTC B1325
• Charging System Test
• Starting System Description and Operation