Battery, Charging System and Starting System Cadillac SRX II

Description and Operation

Remote Function Schematics

Electrical Information Reference

«Circuit Testing»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
«Wiring Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

Engine running, accessories OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12.6 and 15.0 V. If the battery voltage is not within the specified range, refer to «Charging System Test»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system) .
Ignition OFF, disconnect the harness connectors of the appropriate control module.
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 terminals listed below and ground: Terminal 16 X2, K26 Headlamp control module Terminal D, K85 Passenger presence detection module Terminal A X1, K29F Seat heating control module (front) Terminal A X1, K29R Seat heating control module (rear) Terminal 10 X1, P16 Instrument cluster Terminal 7 X1, K41 Parking assist control module Terminal 2 X2, K84 Keyless entry control module Terminal 6 X2, K84 Keyless entry control module Terminal 8 A13, K40 Rear audio control module Terminal 6 X4, K40 Seat memory control module Terminal 38 X1, A11 Radio Terminal 19 X1, K36 Inflatable restraint sensing and diagnostic module Terminal 6, K60 Steering column lock control module Terminal 7, K60 Steering column lock control module Terminal 1 X2, K101 Trailer interface control module Terminal 2, K82 Module telephone control module Terminal 11 X1, T11 Multimedia player interface module If greater than the specified range, test the ground circuit for an open/high resistance.
Verify that a test lamp illuminates between the B+ circuit terminals listed below and ground: Terminal 18 X2, K26 Headlamp control module Terminal A, K85 Passenger presence detection module Terminal B X1, K29F Seat heating control module (front) Terminal B X1, K29R Seat heating control module (rear) Terminal 19, P16 Instrument cluster Terminal 20, P16 Instrument cluster Terminal 1 X1, K41 Parking assist control module Terminal 1 X2, K84 Keyless entry control module Terminal 5 X2, K84 Keyless entry control module Terminal 16, A13 Rear audio control module Terminal 1 X4, K40 Seat memory control module Terminal 44 X1, A11 Radio Terminal 9 X1, K36 Inflatable restraint sensing and diagnostic module Terminal 17 X1, K36 Inflatable restraint sensing and diagnostic module Terminal 3, K60 Steering column lock control module Terminal 5, K60 Steering column lock control module Terminal 3 X2, K101 Trailer interface control module Terminal 1, K82 Module telephone control module Terminal 1 X1, T11 Multimedia player interface module If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
If the circuits test normal, replace the appropriate control module.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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

Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
B+	B1330 03	B1330 03
Ground		B1330 03

The keyless entry control module monitor the system voltage through the battery positive (B+) voltage circuits.

The voltage supplied to the control modules is in the range of 7-26 V.
The ignition is ON.

B1330 03

The control module detects a system voltage less than 8.4 V for 5 seconds.

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

The DTC passes when the malfunction is no longer present.

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

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
«Wiring Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Engine running, accessories OFF, measure and record the battery voltage at the C1 battery terminals. The voltage should be between 12.6 and 15.0 V. If the battery voltage is not within the specified range, refer to «Charging System Test»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system) .
Engine running, observe the keyless entry control module scan tool Battery Voltage parameters. Verify that the scan tool displays a value that is within 2 V of the battery terminal voltage.

Ignition OFF, disconnect the harness connectors of the K84 keyless entry control module.
Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 10 ohms between the ground circuit terminals listed below and ground: Terminal 2 X2 Terminal 6 X2 If greater than the specified range, test the ground circuit for an open/high resistance.
Test for greater than 9 V between the B+ circuit terminals listed below and ground: Terminal 1 X2 Terminal 5 X2 If less than the specified range, test the B+ circuit for a short to ground or an open/high resistance.
If the circuits test normal, replace the K84 keyless entry control module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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

Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
5 V Reference	B1516 08	B1516 08
Signal	B1516 08	B1516 08	B1516 08	B1516 08, B1516 66
Low Reference		B1516 08

The battery current sensor is a 3-wire hall effect current sensor. The body control module (BCM) supplies 5 V and ground to the battery current sensor. The battery current sensor measures the amount of current flowing to or from the battery, and supplies a pulse width modulation (PWM) signal to the BCM.

B1516 08

The BCM is awake.

B1516 66

The BCM is awake.
The engine is OFF.

The battery current signal is less than 4 percent or greater than 96 percent duty cycle for 2 minutes.

B1516 66

The battery current polarity is positive for 2 minutes.

The regulated voltage control (RVC) is disabled.

The DTC passes when the battery current returns to the normal range for 15 seconds.

DTC B1516 08 could be set by overcharging with a battery charger or jump starting.

Schematic Reference

Connector End View Reference

Description and Operation

Body Control System Schematics

Electrical Information Reference

«Circuit Testing»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
«Wiring Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition OFF, disconnect the harness connector at the B18 battery current sensor.
Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 20 ohms between the low reference circuit terminal B and ground. If greater than specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K9 BCM.
Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal A and ground. If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM. If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
Ignition ON, test for 4.8-5.2 V between the signal circuit terminal C and ground. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM. If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
If all circuits test normal, test or replace the B18 battery current sensor.

Verify that the B18 battery current sensor is installed securely around the negative battery cable, with the tape tab pointing away from the negative terminal on the C1 battery. If the B18 battery current sensor is not installed correctly, remove and reinstall the sensor properly.
Replace the B18 battery current sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Battery Positive and Negative Cable Replacement (LF1)»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Positive and Negative Cable Replacement (LAU)»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system)
«Control Module References»(/cadillac/srx/ii-2009-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance
B+	B1517 03, B1517 5A	B1517 03, B1517 5A
Ground		B1517 03, B1517 5A
* All B+ and Ground terminals can set these DTCs.

The body control module (BCM) has designated circuits for monitoring vehicle system voltage. The BCM monitors the system voltage to ensure that the voltage stays within the proper range. Damage to components, and incorrect data may occur when the system voltage is out of range. The BCM monitors the system voltage over an extended length of time.

The BCM has power and ground.
The ignition is not in the START position.

B1517 03

The battery voltage is less than 11 V.
The engine speed is greater than 1,100 RPM.
The above conditions are met for 15 seconds.

B1517 07

The battery voltage is greater than 16 V.
The engine speed is greater than 1,100 RPM.
The above conditions are met for 15 seconds.

B1517 5A

The battery voltage differs by 2 V on the BCM battery sense circuits for 10 seconds.

The instrument panel cluster illuminates the charge indicator.
The driver information center displays the SERVICE BATTERY CHARGING SYSTEM warning message.

The DTC will clear current status when fault is no longer present.
The history DTC will clear after 50 consecutive ignition cycles have occurred without a malfunction.

A high or low voltage DTC set in multiple modules indicates a concern in the charging system. Refer to «Charging System Test»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system) .
This DTC may be set by overcharging with a battery charger, or by jump starting.
Inspect the ground connection, and ensure that it is clean and tight.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
«Wiring Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Engine running, accessories OFF, measure and record the voltage at the battery voltage at the C1 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/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system) .
Observe the scan tool BCM Battery Voltage parameter. Verify that the scan tool displays a valve that is within 2 V of the battery terminal voltage.

Ignition OFF, disconnect the harness connectors X1, X2, X4, X5, and X6 at the K9 BCM.
Ignition OFF, test for less than 3.0 ohms between the ground circuit terminals listed below and ground: Terminal 1 X1 Terminal 2 X2 If not within the specified range, test the ground circuit for an open/high resistance.
Ignition ON, verify a test lamp illuminates between the B+ circuit terminals listed below and ground: Terminal 2 X1 Terminal 3 X1 Terminal 4 X1 Terminal 1 X2 Terminal 3 X2 Terminal 4 X2 Terminal 20 X4 Terminal 3 X5 Terminal 4 X5 If the test lamp does not illuminate, test the B+ circuits for a short to ground or an open/high resistance.
If all the circuits test normal, test or replace the K9 BCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for BCM replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/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 battery voltage level during an engine crank event to detect a low battery voltage condition.

The ignition must be in the crank position for this code to set.

Conditions for Setting the DTC

A minimum crank battery voltage is less than the minimum crank battery voltage threshold for 16 consecutive crank events.

A driver information center (DIC) message is displayed.

The DTC will clear if the minimum crank voltage is greater than the minimum crank voltage threshold during a crank event.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
«Wiring Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Before replacing the C1 battery perform the Battery Inspection/Test .

Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/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 of the electrical system. If the BCM senses that the state of charge at ignition On is 30 percent lower than what it was when the engine was running.

The ignition must be in Accessory or Run mode for this code to set.

The state of charge at ignition ON is 30 percent lower than when the engine was running and battery drain is more than 2 A.

There is no battery telltale illuminated or DIC message displayed.

The DTC will clear if the fault does not return after 50 consecutive ignition cycles.
The DTC will clear when run state of charge is greater than or equal to 80 percent.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
«Wiring Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Refer to Battery Electrical Drain/Parasitic Load Test .

Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance
B+	C0800 03	C0800 03
IGN	C0800 03	C0800 03
Ground		C0800 03

The following module/sensors monitor the system voltage circuit to determine if the voltage is within the normal operating range

Parking brake control module
Electronic brake control module
Suspension control module
Steering wheel angle sensor
Rear differential clutch control module
Multi-axis acceleration sensor

Ignition is ON.

C0800 03

The module/sensor detects that the system voltage is less than 9.2 V for 7 seconds.

C0800 07

The module/sensor detects that the system voltage is greater than 16 V for 7 seconds.

A DIC message and/or a warning indicator may be displayed.

The system voltage returns to normal operating range.

A high or low voltage DTC set in multiple module/sensors indicates a concern in the charging system.
A possible cause of this DTC could be overcharging with a battery charger or jump starting.

Schematic Reference

«Antilock Brake System Schematics»(/cadillac/srx/ii-2009-2012/remont/anti-locktraction-control/#antilock-brake-system-with-traction-control-system-stability-control-system)
«Electronic Suspension Control Schematics»(/cadillac/srx/ii-2009-2012/remont/electronic-suspension/#suspension-control-system-suspension-damping)
«Park Brake System Schematics»(/cadillac/srx/ii-2009-2012/remont/parking-brake-system/#parking-brake-system)
«Rear Axle Schematics»(/cadillac/srx/ii-2009-2012/remont/differentials-drive-axles/#rear-drive-axle)

Connector End View Reference

Engine Controls Schematics (LAU) or Engine Controls Schematics (LF1)

Electrical Information Reference

«Circuit Testing»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
«Wiring Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Engine running, measure and record the voltage at the battery terminals.
Verify that the battery voltage is 12.6-15.0 V. If the battery voltage is not within the specified range, refer to «Charging System Test»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system) .
Observe the scan tool of the appropriate module Battery Positive parameter. The reading should be between 12.6-15.0 V.

Ignition OFF, disconnect the harness connectors at the appropriate module/sensor.
Test for less than 3 ohms between the ground circuit terminals listed below and ground: Terminal H, K83 Parking brake control module Terminal 16, K17 Electronic brake control module Terminal 1, K19 Suspension control module Terminal L X1, K47 Rear differential clutch control module Terminal 6, B99 Steering wheel angle sensor Terminal 6, B119 Multi-axis acceleration sensor If greater than the specified range, test the ground circuit for an open/high resistance.
Ignition ON, verify a test lamp illuminates between the B+/ignition circuits listed below and ground: Terminal A, K83 Parking brake control module Terminal 1, K17 Electronic brake control module Terminal 32, K17 Electronic brake control module Terminal 32, K19 Suspension control module Terminal M X1, K47 Rear differential clutch control module Terminal 5, B99 Steering wheel angle sensor Terminal 5, B119 Multi-axis acceleration sensor If the test lamp does not illuminate, test the circuit for an open/high resistance.
If all circuits test normal, replace the appropriate module/sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Steering Angle Sensor Replacement»(/cadillac/srx/ii-2009-2012/remont/steering-column-switches/#steering-wheel-and-steering-column)
«Vehicle Yaw Sensor with Vehicle Lateral and Longitudinal Accelerometer Replacement»(/cadillac/srx/ii-2009-2012/remont/anti-locktraction-control/#antilock-brake-system-with-traction-control-system-stability-control-system)
«Control Module References»(/cadillac/srx/ii-2009-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for electronic brake control module replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
B+	P0562	P0562
Ground		P0562

The engine control module (ECM) monitors the 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.

The ignition is ON.

The ECM detects that the battery voltage is less than 2.54 V for 5 seconds.

DTC P0560 is a C type DTC.

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

Schematic Reference

Connector End View Reference

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
«Wiring Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Engine running, accessories OFF, measure and record the battery voltage at the C1 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/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system) .
S39 Ignition Switch OFF, disconnect the harness connectors at the K20 ECM.
S39 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 terminals listed below and ground. Terminal 73 X2 (LF1) Terminal 73 X3 (LF1) Terminal 1 X2 (LAU) Terminal 2 X2 (LAU) Terminal 4 X2 (LAU) If greater than the specified range, test the ground circuit for an open/high resistance.
Verify that a test lamp illuminates between the B+ circuit terminals listed below and ground. Terminal 52 X1 (LF1) Terminal 56 X2 (LAU) If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
If all circuits test normal, replace the K20 ECM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ECM replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
B+	P0562	P0562
Ground		P0562

The following control modules monitor the system voltage to ensure that the voltage stays within the proper range

Engine control module
Fuel pump control module
Transmission control module

Damage to components, and incorrect data may occur when the voltage is out of range.

Engine Control Module

The system voltage is between 9.5-18 V.

Fuel Pump Control Module

The engine is running.

Transmission Control Module

Engine speed is 1200 RPM or greater.
The system voltage is between 8.6-18 V.

The engine control module detects a system voltage below 10 V for 5 seconds.

Fuel Pump Control Module or Transmission Control Module

The module detects a system voltage below 9 V for 4 seconds.

DTC P0562 is a C type DTC.

Schematic Reference

«Engine Controls Schematics (LAU)»(/cadillac/srx/ii-2009-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-28l-30l-schematic-routing-diagrams) or «Engine Controls Schematics (LF1)»(/cadillac/srx/ii-2009-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-28l-30l-schematic-routing-diagrams)
«Automatic Transmission Controls Schematics»(/cadillac/srx/ii-2009-2012/remont/automatic-trans/#automatic-transmission-6t706t75-wiring-schematics) for the MH2 and MH4 transmissions

Connector End View Reference

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
«Wiring Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Engine running, accessories OFF, measure and record the battery voltage at the C1 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/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system) .
Observe the scan tool of the appropriate control module Ignition 1 Signal parameter. Verify that the scan tool displays a value that is within 2 V of the battery terminal voltage.

Ignition OFF, disconnect the harness connectors at the K20 ECM.
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 terminals listed below and ground: Terminal 73 X2 (LF1) Terminal 73 X3 (LF1) Terminal 1 X2 (LAU) Terminal 2 X2 (LAU) Terminal 4 X2 (LAU) If greater than the specified range, test the ground circuit for an open/high resistance.
Connect a 15 A fused jumper wire between B+ and the ECM PWR/TRN relay switch control terminal 87. Ignition ON, verify that a test lamp illuminates between the IGN/B+ circuit terminals listed below and ground: Terminal 52 X1 (LF1) Terminal 70 X1 (LF1) Terminal 73 X1 (LF1) Terminal 3 X2 (LAU) Terminal 5 X2 (LAU) Terminal 6 X2 (LAU) Terminal 41 X2 (LAU) Terminal 56 X2 (LAU) Terminal 54 X2 (LAU) If the test lamp does not illuminate, test the IGN/B+ circuit for a short to ground or an open/high resistance.
If all circuits test normal, replace the K20 ECM.

Ignition OFF, disconnect the harness connectors at the K27 fuel pump control module.
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 25 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
Verify that a test lamp illuminates between the IGN/B+ circuit terminals listed below and ground: Terminal 1 Terminal 21 If the test lamp does not illuminate, test the IGN/B+ circuit for a short to ground or an open/high resistance.
If all circuits test normal, replace the K27 fuel pump control module.

Ignition OFF, disconnect the harness connectors at the T12 transmission.
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 terminals listed below and ground: Terminal 1 (MH2 or MH4) Terminal 18 (MH2 or MH4) Terminal 9 (MXE) If greater than the specified range, test the ground circuit for an open/high resistance.
Ignition ON, verify that a test lamp illuminates between the IGN/B+ circuit terminals listed below and ground: Terminal 10 (MH2 or MH4) Terminal 1 (MXE) If the test lamp does not illuminate, test the IGN/B+ circuit for a short to ground or an open/high resistance.
If all circuits test normal, replace the K71 transmission control module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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

Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
B+	P0562	P0562
Ground		P0562

The following control modules monitor the system voltage to ensure that the voltage stays within the proper range

Engine control module
Fuel pump control module
Transmission control module

Damage to components, and incorrect data may occur when the voltage is out of range.

The vehicle speed is above 8 km/h (5 mph).
The system voltage is between 9.5-18 V.

The ignition is ON.

The system voltage is between 8.6-18.0 V.

The engine control module detects a system voltage above 16 V for less than 1 second.

The module detects the system voltage is greater than 18 V.

DTC P0563 is a C type DTC.

A possible cause of this DTC could be overcharging with a battery charger or jump starting.
A high voltage value in multiple modules indicates a concern in the charging system.

Schematic Reference

«Engine Controls Schematics (LAU)»(/cadillac/srx/ii-2009-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-28l-30l-schematic-routing-diagrams) or «Engine Controls Schematics (LF1)»(/cadillac/srx/ii-2009-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-28l-30l-schematic-routing-diagrams)
«Automatic Transmission Controls Schematics»(/cadillac/srx/ii-2009-2012/remont/automatic-trans/#automatic-transmission-6t706t75-wiring-schematics) for the MH2 and MH4 transmissions

Connector End View Reference

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
«Wiring Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Engine running, accessories OFF, measure and record the battery voltage at the C1 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/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system) .
Engine running, observe the scan tool of the appropriate control module Ignition 1 signal parameter. Verify that the scan tool displays a value that is within 2 V of the battery terminal voltage. If not within the specified range, replace the appropriate control module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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

Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
Control	P0615, P0616*	P0615, P0616*	P0615, P0617*
Ground		P0615, P0616*
* LF1 ** LAU

When the ignition switch is placed in the START position, a discrete signal is supplied to the body control module (BCM) notifying it that the ignition is in the START position. The BCM then sends a message to the engine control module (ECM) that crank has been requested. The ECM then verifies that the clutch pedal is depressed or the transmission is in Park/Neutral. If it is, the ECM then supplies 12 V to the control circuit of the starter relay. When this occurs, battery voltage is supplied through the switch of the starter relay to the starter solenoid.

The ignition is in the START position.
The system voltage is between 9.5-18 V.

The ECM detects improper voltage on the control circuit of the starter relay.

DTC P0615, P0616, and P0617 are C type DTCs.

Schematic Reference

Connector End View Reference

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
«Wiring Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Ignition OFF, disconnect the KR27 starter relay.
Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 10 ohms between the relay ground circuit terminal 85 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
Ignition ON, verify a test lamp illuminates between the B+ circuit terminal 30 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the control circuit terminal 87 for a short to ground.
Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 87 and ground. If the test lamp illuminates, test the control circuit for a short to voltage.
Parking brake applied and the transmission is in NEUTRAL or PARK. Momentarily install a 30 A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87. Verify the starter is activated. If the starter does not activate, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the starter.
Ignition OFF, connect a test lamp between the control circuit terminal 86 and the ground circuit terminal 85.
Transmission in park or neutral, cycle the ignition between the OFF and CRANK position. The test lamp should turn ON and OFF when changing between the selected states. If the test lamp is always ON, test the control circuit for short to voltage. If the circuit tests normal, replace the K20 ECM. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
If all circuits tests normal, replace the KR27 starter relay.

Relay Test

Ignition OFF, disconnect the starter relay.
Test for 60-180 ohms between terminals 85 and 86. If not within the specified range, replace the relay.
Test for infinite resistance between the following terminals: 30 and 86 30 and 87 30 and 85 85 and 87 If not the specified value, replace the relay.
Install a 20 A fused jumper wire between relay terminal 85 and 12 V. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms between terminals 30 and 87. If greater than specified range, replace the relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Relay Replacement (Attached to Wire Harness)»(/cadillac/srx/ii-2009-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions) or «Relay Replacement (Within an Electrical Center)»(/cadillac/srx/ii-2009-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
«Control Module References»(/cadillac/srx/ii-2009-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
B+		P0621
Control	P0621	P0621	P0621
Signal	P0622, P0625*	P0622, P0625*	P0622, P0626*	P0622, P0625*
* LF1 ** LAU

The engine control module (ECM) uses the generator turn ON control circuit to control the load of the generator on the engine. A high side driver in the ECM applies a voltage to the voltage regulator. This controls the voltage regulator to turn the field circuit ON and OFF. The ECM monitors the state of the generator turn ON control circuit. The ECM should detect low voltage on generator turn on control circuit when the ignition is ON and the engine is OFF, or when the charging system malfunctions. With the engine running, the ECM should detect high voltage on the generator turn on control circuit.

The ignition ON, engine OFF for ignition on test.
The engine is running for the run test.

During the ignition on test, the ECM detects voltage on the generator turn on control circuit for 5 seconds.
During the run test, the ECM detects low voltage on the generator turn on control circuit for 15 seconds.

DTC P0621 is a C type DTC.

Schematic Reference

Connector End View Reference

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
«Wiring Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

LAU Engine

Verify that a test lamp illuminates between the G13 generator B+ terminal A X2 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
Ignition OFF, disconnect the X1 harness connector at the G13 generator.
Ignition ON, test for less than 1 V between the control circuit terminal 1 and ground. If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
Engine running, test for greater than 3.5 V between the control circuit terminal 1 and ground. If less than the specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
If the circuit tests normal, replace the G13 generator.

LF1 Engine

Verify that a test lamp illuminates between the G13 generator B+ terminal A X2 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
Ignition OFF, disconnect the X1 harness connector at the G13 generator.
Ignition ON, test for 4.5-5.5 V between the control circuit terminal 1 and ground. If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM. If less than the specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal replace the K20 ECM.
If the circuits test normal, replace the G13 generator.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Generator Replacement (LF1)»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system) or «Generator Replacement (LAU)»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system)
«Control Module References»(/cadillac/srx/ii-2009-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
B+		P0621
Control	P0621	P0621	P0621
Signal	P0622	P0622	P0622	P0622

The engine control module (ECM) uses the generator field duty cycle signal circuit, or F-terminal circuit, to monitor the duty cycle of the generator. The generator field duty cycle signal circuit connects to high side of the field windings in the generator. A pulse width modulated (PWM) high side driver in the voltage regulator turns the field windings ON and OFF. The ECM uses the PWM signal input to determine the generator load on the engine. This allows the ECM to adjust the idle speed to compensate for high electrical loads. The ECM monitors the status of the generator field duty cycle signal circuit. When the ignition is ON and the engine is OFF, the ECM should detect a duty cycle near 0 percent. When the engine is running, the duty cycle should be between 5-99 percent.

Ignition ON engine OFF, for the Ignition ON test.
Engine running, engine speed less than 3,000 RPM for the RUN test.

DTC P0621 is not set.
Ignition ON engine OFF, the ECM detects a PWM signal that is greater than 65 percent for 5 seconds.
Engine running, the ECM detects a PWM signal that is less than 5 percent for 15 seconds.

DTC P0622 is a C type DTC.

Schematic Reference

Connector End View Reference

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
«Wiring Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Engine running, observe the scan tool GEN-F Terminal Signal Circuit parameter. The GEN-F Terminal Signal Circuit parameter should display between 5-99 percent.

Verify that a test lamp illuminates between the G13 generator B+ terminal A X2 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
Ignition OFF, disconnect the X1 harness connector at the G13 generator.
Ignition ON, verify the scan tool ECM GEN-F Terminal Signal parameter displays less than 5 percent. If greater than the specified range, test the signal circuit terminal 2 for a short to voltage. If the circuit tests normal, replace the K20 ECM.
Install a 3 A fused jumper wire between B+ and the signal circuit terminal 2.
Verify the scan tool ECM GEN-F Terminal Signal parameter displays greater than 95 percent. If less than the specified range, test the signal circuit terminal 2 for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
If the circuit tests normal replace the G13 generator.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Generator Replacement (LF1)»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system) or «Generator Replacement (LAU)»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system)
«Control Module References»(/cadillac/srx/ii-2009-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
B+	P0625	P0625
Signal	P0625	P0625	P0626
Control	P0621	P0621	P0621

The engine control module (ECM) uses the generator field duty cycle signal circuit, or F-terminal circuit, to monitor the duty cycle of the generator. The generator field duty cycle signal circuit connects to high side of the field windings in the generator. A pulse width modulated (PWM) high side driver in the voltage regulator turns the field windings ON and OFF. The ECM uses the PWM signal input to determine the generator load on the engine. This allows the ECM to adjust the idle speed to compensate for high electrical loads. The ECM monitors the status of the generator field duty cycle signal circuit. When the ignition is ON and the engine is OFF, the ECM should detect a duty cycle near 0%. When the engine is running, the duty cycle should be between 5-99%.

P0625

The engine is running.
The engine speed is less than 3 000 RPM.

P0626

The engine is not running.
The ignition is in the ON position.

The ECM detects a pulse width modulated (PWM) signal less than 5% for 15 s.

The ECM detects a pulse width modulated (PWM) signal greater than 65% for 15 s.

DTC P0625 and P0626 are C type DTCs.

Schematic Reference

Connector End View Reference

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
«Wiring Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Engine running, observe the scan tool Generator F-Terminal Signal Circuit parameter. The Generator F-Terminal Signal Circuit parameter should display between 5-99%.

Verify that a test lamp illuminates between the G13 Generator B+ terminal A X1 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
Ignition OFF, disconnect the X2 harness connector at the G13 Generator.
Ignition ON, verify the scan tool Generator F-Terminal Signal parameter displays less than 5%. If greater than the specified range, test the signal circuit terminal 2 for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
Install a 3 A fused jumper wire between B+ and the signal circuit terminal 2.
Verify the scan tool Generator F-Terminal Signal parameter displays greater than 95%. If less than the specified range, test the signal circuit terminal 2 for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
If the circuit tests normal replace the G13 Generator.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Generator Replacement (LF1)»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system) or «Generator Replacement (LAU)»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system)
«Control Module References»(/cadillac/srx/ii-2009-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup and programming

Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
B+	P0625	P0625
Signal	P0625	P0625	P0626
Control	P2500	P2500	P2501

The engine control module (ECM) uses the generator turn on control circuit, or L-terminal circuit, to control the load of the generator on the engine. A high side driver in the ECM applies a voltage to the voltage regulator. This controls the voltage regulator to turn the field circuit ON and OFF. The ECM monitors the state of the generator turn ON control circuit. The ECM should detect low voltage on generator turn on control circuit when the ignition is ON and the engine is OFF, or when the charging system malfunctions. With the engine running, the ECM should detect high voltage on the generator turn on control circuit. The ECM performs tests to determine the status of the generator turn on control circuit.

P2500

The engine is running.

P2501

The ignition is ON.
The engine is OFF.

The ECM detects low voltage on the generator turn on control circuit for 2 seconds.

The ECM detects high voltage on the generator turn on control circuit for 2 seconds.

The charge indicator turns ON 15 seconds after the DTC sets.

The DTC will pass when the conditions for setting the DTC are no longer met for 2 seconds.
A history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
The charge indicator turns OFF 15 seconds after the DTC passes.

Schematic Reference

Connector End View Reference

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
«Wiring Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Verify that a test lamp illuminates between the G13 generator B+ terminal A X2 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
Ignition OFF, disconnect the X1 harness connector at the G13 generator.
Ignition ON, test for less than 1 V between the control circuit terminal 1 and ground. If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
Engine running, test for greater than 3 V between the control circuit terminal 1 and ground. If less than the specified range, test the control circuit for a short to ground, or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
If all circuits test normal, test or replace the G13 generator.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Generator Replacement (LF1)»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system) or «Generator Replacement (LAU)»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system)
«Control Module References»(/cadillac/srx/ii-2009-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming

Symptoms - Engine Electrical

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

Perform «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/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: There are no DTCs set. The control modules can communicate via the serial data link.
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/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system__battery-description-and-operation) «Charging System Description and Operation»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system) «Electrical Power Management Description and Operation»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system) «Starting System Description and Operation»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system__starting-system-description-and-operation) «Load Shed System Description and Operation»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system)

Visual/Physical Inspection

Inspect for aftermarket devices which could affect the operation of the starting and charging systems. Refer to «Checking Aftermarket Accessories»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__checking-aftermarket-accessories) .
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

«Battery Inspection/Test»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system)
«Battery Electrical Drain/Parasitic Load Test»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system)
«Charging System Test»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system)
«Generator Noise Diagnosis»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system)
«Starter Solenoid Does Not Click»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system)
«Starter Solenoid Clicks, Engine Does Not Crank»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system)
«Engine Cranks Slowly»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system)
«Starter Noise Diagnosis»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system)

Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

WARNING

Refer to Battery Disconnect Warning .

Note. The battery test using the EL 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. Use the Out of Vehicle test for each battery when testing a vehicle with dual batteries.

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

If testing the vehicle with the battery cables still connected, wiggle the EL 42000 clips on the terminal bolt. This may cut through any coating or through any oxidation that may be present on the bolt. Even new bolts contain a protective coating that may insulate or cause a resistance in the test circuit.
If correct connections to the battery terminal bolts in the vehicle are in doubt, perform the following steps: Disconnect the negative battery cable. Disconnect the positive battery cable. Install the test adapters on the terminals. Follow the instructions for testing a removed battery.
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. Install the tester adapters. 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.
Use the correct terminal adapters. Do not use any common bolts or a combination of bolts, of nuts, and of washers as adapters when testing the battery. Use the test adapters that are provided with the EL 42000 or GM P/N 12303040 terminal adapters. If the adapters that are provided with the EL 42000 require replacement, use GM P/N 12303040. Any other adapter may not contact the correct areas of the battery terminal, causing a resistance that may result in an invalid battery test result.

Schematic Reference

Connector End View Reference

Description and Operation

Control Module References

Electrical Information Reference

«Circuit Testing»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
«Wiring Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL 42000: Battery Tester

For equivalent regional tools, refer to Special Tools .

WARNING

Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components. For Vehicles equipped with OnStar® (UE1) with Back Up Battery: The Back Up Battery is a redundant power supply to allow limited OnStar® functionality in the event of a main vehicle battery power disruption to the VCIM (OnStar®module). Do not disconnect the main vehicle battery or remove the OnStar® fuse with the ignition key in any position other than OFF. Retained accessory power (RAP) should be allowed to time out or be disabled (simply opening the driver door should disable RAP) before disconnecting power. Disconnecting power to the OnStar® module in any way while the ignition is On or with RAP activated may cause activation of the OnStar® Back-Up Battery (BUB) system and will discharge and permanently damage the back-up battery. Once the Back-Up Battery is activated it will stay on until it has completely discharged. The BUB is not rechargeable and once activated the BUB must be replaced.

Inspect the C1 battery for a cracked, broken, or damaged case, which may be indicated by battery acid leakage. If there is any apparent damage, replace the C1 battery.
Verify the cold cranking amperage and amp hour rating of the battery to the original battery or original equipment (OE) specification. Refer to «Battery Usage»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system__battery-usage) . If the C1 battery does not meet or exceed specifications, replace the C1 battery.
Verify that the battery cables are clean and tight. The battery terminal bolts should be torqued as specified in «Fastener Tightening Specifications»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system__fastener-tightening-specifications) . If the battery cables need to be cleaned, clean as required and tighten as specified. If the battery cables are damaged, replace then tighten as specified.
Install the EL 42000 and follow directions supplied by the tester. If the tester calls for charging the battery, refer to «Battery Charging»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system) .
The battery should not have a history of being discharged or having low voltage. If the battery has frequently been discharged or had low voltage while the engine is running, refer to «Charging System Test»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system) . If the battery has frequently been discharged or had low voltage while the ignition is OFF, refer to «Battery Electrical Drain/Parasitic Load Test»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system) .

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Battery Positive and Negative Cable Replacement (LF1)»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Positive and Negative Cable Replacement (LAU)»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system)
«Battery Replacement»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system)

Special Tools

EL 42000: Battery Tester

For equivalent regional tools, refer to Special Tools .

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

Battery State of Charge

Note. Using voltage to determine the batteries state of charge 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 state of charge will only be an estimate.

The maintenance-free batteries state of charge 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 state of charge

Be sure all electrical loads are turned OFF.
Determine whether the 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.
Estimate the battery temperature by determining the average temperature to which the battery has been exposed for the past 12 hours.
Measure the battery voltage at the battery terminals. Refer to the following table to determine the state of charge according to the estimated battery temperature

Battery Voltage	% Charge at 0°C (32°F)	% Charge at 25°C (75°F)
12.75 V	100%	100%
12.7 V	100%	90%
12.6 V	90%	75%
12.45 V	75%	65%
12.2 V	65%	45%
12.0 V	40%	20%

Use the state of charge information as follows

A battery with a state of charge that is below 65 percent must always be recharged before returning it to service or continuing storage.
A battery with a state of charge 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 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 battery will vary depending upon the following factors

The battery charger capacity-The higher the charger amperage, the less time it will take to charge the battery.
The state of charge of the 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 V, 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.
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

CAUTION

Turn OFF the ignition when connecting or disconnecting the battery cables, the battery charger or the jumper cables. Failure to do so may damage the ECM/PCM or other electronic components.

CAUTION

Refer to Fastener Caution .

When charging side-terminal batteries with the battery cables connected, connect the charger to the positive cable bolt and to a ground located away from the battery. When charging side-terminal batteries with the battery cables disconnected, install the battery side terminal adapters and connect the charger to the adapters.

Tighten: Tighten the battery side terminal adapters to 15 N.m (11 lb ft).

Use the following procedure to charge the battery

Turn OFF the charger.
Ensure that all of the battery terminal connections are clean and tight.
Connect the charger positive lead to the battery positive terminal on the battery or the remote jumper stud underhood.
Connect the negative charger lead to a solid engine ground or to a ground stud in the engine compartment that is connected directly to the battery negative terminal, but away from the battery. If the negative battery cable is disconnected and a terminal adapter is being used, connect directly to the adapter.
Turn ON the charger and set to the highest setting for normal charging.
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.
After charging, test the battery. Refer to «Battery Inspection/Test»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system) .

12 V Battery

The following procedure is for the 12 V battery only.

Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/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.

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.
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/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system__battery-description-and-operation) .
Verify that the battery and charging system are in proper working order. Refer to «Battery Charging»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system) and «Charging System Test»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system) .
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.
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/srx/ii-2009-2012/remont/communication-devices/#data-communication-system__body-control-system-description-and-operation) for the system or modules description and operation.
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.
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.
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.
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.
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.
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.

Current Drain	Days
25 mA	33
50 mA	16.5
75 mA	11
100 mA	8.25
250 mA	3.3
500 mA	1.65
750 mA	1
1 A	0.8
2 A	0.4

Schematic Reference

Connector End View Reference

Electrical Information Reference

«Circuit Testing»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
«Connector Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Wiring Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#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

Connect an inductive pickup probe to the negative battery cable that can read down to 1 mA.
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/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system) .

Using the EL 38758 Parasitic Draw Test Switch

Ignition OFF, disconnect the battery negative cable from the battery. Refer to «Battery Negative Cable Disconnection and Connection»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system) .
Turn the EL 38758: switch knob to the OFF position.
Install the male end of the EL 38758: switch to the battery ground terminal.
Install the battery negative cable to the female end of the EL 38758: switch.
Turn the EL 38758: switch knob to the ON position.
Road test the vehicle and activate all of the accessories such as the radio and air conditioning.
Ignition OFF, connect a 10 A fused jumper wire to the test switch tool terminals.
Turn the EL 38758: switch knob to the OFF position. The current now flows through the jumper wire.
Check the fuse in the jumper wire. The fuse should be OK. Failed: If the jumper wire fuse is blown, refer to «Circuit/System Testing»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system) . Passed
Turn the EL 38758: switch knob to the ON position. Remove the fused jumper wire.
Connect a DMM set to the 10 A DC scale between the test switch tool terminals.
Turn the EL 38758: switch knob to the OFF position. The current now flows through the DMM.
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/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system) .

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

Stuck switch
Stuck relay
Control module

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for control module replacement, programming and setup

Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Schematic Reference

Connector End View Reference

Description and Operation

Generator Replacement (LF1) or Generator Replacement (LAU)

Electrical Information Reference

«Circuit Testing»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
«Wiring Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Engine running, observe the charge indicator on the instrument cluster or message in the driver information center display. The charge indicator on the instrument cluster should be turned OFF and the driver information center display should not display any charging system message.

Ignition ON, verify that no G13 Generator or B18 battery current sensor DTCs are set that would cause a charging system concern. If DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
Ignition OFF, measure the voltage across the battery terminals. The voltage should read 12.0 V or greater at room temperature. If not within the specified value, refer to «Battery Inspection/Test»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system) .
Engine ON, increase engine speed to 2,500 RPM. Verify the battery voltage is between 12.6-15.0 V. If not within specified range, replace the G13 generator.
Engine ON, increase engine speed to 2,500 RPM. Turn ON all vehicle accessories. Verify the battery voltage is between 12.6-15.0 V. If not within specified range, replace the G13 generator.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Noise from a generator may be due to electrical or mechanical noise. Electrical noise or magnetic whine usually varies with the electrical load placed on the generator and is a normal operating characteristic of all generators. When diagnosing a noisy generator, it is important to remember that loose or misaligned components around the generator may transmit the noise into the passenger compartment and that replacing the generator may not solve the problem.

Start the engine. Verify the noise can be heard. Compare the concern to a similar vehicle.
Perform a charging system test. Verify that the generator is charging properly.
Inspect the generator, generator mounting, wiring harness, heater hoses, A/C lines, or other accessory equipment that may be misrouted or be the cause of noise being transmitted into the passenger compartment.
Ignition OFF, remove the engine drive belt. Verify the generator, A/C compressor, water pump pulley, power steering pump, idler pulley, and tensioner pulley spin freely. If any of the pulleys do not spin freely, replace the affected component.
Start the engine, with the drive belt removed. Verify that the noise goes away. Operate the engine for no longer than 30-40 seconds. If the noise is still present, the generator is not the cause of the noise.
Loosen all generator mounting bolts and ensure the generator is properly aligned. Tighten the mounting bolts to specification, refer to «Generator Replacement (LF1)»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system) or «Generator Replacement (LAU)»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system) .

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Drive Belt Replacement»(/cadillac/srx/ii-2009-2012/remont/mechanical/#engine-mechanical-28l-or-30l-repair-instructions-on-vehicle-1-of-2) for the 2.8L, 3.0L, 3.2L and 3.6L engines
«Drive Belt Tensioner Replacement»(/cadillac/srx/ii-2009-2012/remont/mechanical/#engine-mechanical-28l-or-30l-repair-instructions-on-vehicle-1-of-2) for the 2.8L, 3.0L, 3.2L and 3.6L engines
«Drive Belt Idler Pulley Replacement»(/cadillac/srx/ii-2009-2012/remont/mechanical/#engine-mechanical-28l-or-30l-repair-instructions-on-vehicle-1-of-2) for the 2.8L, 3.0L, 3.2L and 3.6L engines
«Generator Replacement (LF1)»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system) or «Generator Replacement (LAU)»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system)

Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
B+	1	1
Signal	2	1
Control Terminal 85		1	3
Control Terminal 87	1	1	3
Ground		1
1. Starter Solenoid Does Not Click 2. Cranks In Any Gear 3. Cranks All The Time

When the ignition mode switch is placed in the START position, a discrete signal is supplied to the body control module (BCM) notifying it that the ignition is in the START position. The BCM then sends a serial data message to the engine control module (ECM) that crank has been requested. The ECM then verifies that the clutch is fully depressed or the automatic transmission is in Park/Neutral. If it is, the ECM then supplies 12 V to the control circuit of the starter relay. When this occurs, battery voltage is supplied through the switch of the starter relay to the starter solenoid.

Schematic Reference

«Starting and Charging Schematics»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system)
«Automatic Transmission Controls Schematics»(/cadillac/srx/ii-2009-2012/remont/automatic-trans/#automatic-transmission-6t706t75-wiring-schematics)

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
«Wiring Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, verify that no ignition, starter relay, brake pedal position sensor, theft deterrent, or automatic transmission DTCs are set that would cause the ECM to disable engine starting. If DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
Ignition ON, observe the scan tool BCM Push Button Ignition Switch parameter. Place the ignition switch in the crank position, the parameter should display Active. If not the specified value, refer to «Power Mode Mismatch»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures) .
Transmission range selector in park, verify the scan tool Transmission Control Module (TCM) Internal Mode Switch parameter displays Park. If the TCM Internal Mode Switch parameter does not indicate Park, refer to «Transmission Internal Mode Switch Logic»(/cadillac/srx/ii-2009-2012/remont/automatic-trans/#automatic-transmission-6t706t75-specifications__transmission-internal-mode-switch-logic) .
Transmission range selector in park or neutral attempt to start the vehicle. The crank relay should click and the engine should begin cranking.

Ignition ON and transmission in Park, with a scan tool verify the ECM Park/Neutral Position Switch parameter displays Active. If the parameter does not display Active, test the ECM Park/Neutral signal circuit terminal listed below for a short to ground or an open/high resistance: Terminal 17 X2 (LAU engine) Terminal 58 X2 (LF1 engine)
Ignition ON, with a scan tool verify the ECM Ignition 1 Signal parameter is greater than 10 V. If less than the specified range, test the ECM ignition circuit terminal listed below for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM. 51 X1 LF1 54 X2 LAU
Ignition OFF, disconnect the KR27 starter relay.
Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5.0 ohms between the relay ground circuit terminal 86 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
Ignition ON, verify a test lamp illuminates between the B+ circuit terminal 30 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the control circuit terminal 87 for a short to ground.
Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 87 and ground. If the test lamp illuminates, test the control circuit for a short to voltage.
Parking brake applied and transmission in PARK, momentarily install a 30 A fused jumper wire between the B+ circuit terminal 30 and the control output circuit terminal 87. Verify the starter is activated. If the starter does not activate, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the M64 starter motor.
Connect a test lamp between the control circuit terminal 86 and the ground circuit terminal 85.
Transmission in park/neutral, command the starter relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
If all circuits test normal, test or replace the KR27 starter relay.

Ignition OFF, disconnect the KR27 starter relay.
Test for 60-180 ohms between terminals 85 and 86. If not within the specified range, replace the relay.
Test for infinite resistance between the following terminals: 30 and 86 30 and 87 30 and 85 85 and 87 If not the specified value, replace the relay.
Install a 20 A fused jumper wire between relay terminal 85 and 12 V. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms between terminals 30 and 87. If greater than specified range, replace the relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Manual Shift Detent Lever with Shaft Position Switch Assembly Replacement»(/cadillac/srx/ii-2009-2012/remont/automatic-trans/#automatic-transmission-6t706t75-repair-instructions-on-vehicle)
«Relay Replacement (Attached to Wire Harness)»(/cadillac/srx/ii-2009-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions) or «Relay Replacement (Within an Electrical Center)»(/cadillac/srx/ii-2009-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
«Control Module References»(/cadillac/srx/ii-2009-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, programming and setup

Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
«Wiring Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12.0-15.0 V. If not within the specified range, refer to «Battery Charging»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system) .
Remove the drive belts. Refer to «Drive Belt Tensioner Replacement»(/cadillac/srx/ii-2009-2012/remont/mechanical/#engine-mechanical-28l-or-30l-repair-instructions-on-vehicle-1-of-2) , «Drive Belt Idler Pulley Replacement»(/cadillac/srx/ii-2009-2012/remont/mechanical/#engine-mechanical-28l-or-30l-repair-instructions-on-vehicle-1-of-2) or «Drive Belt Replacement»(/cadillac/srx/ii-2009-2012/remont/mechanical/#engine-mechanical-28l-or-30l-repair-instructions-on-vehicle-1-of-2) .
Place the S39 ignition switch to the CRANK position. If the engine cranks, inspect the engine and belt drive system for mechanical binding, seized engine, or seized generator, etc. If the engine does not crank, refer to «Engine Will Not Crank - Crankshaft Will Not Rotate»(/cadillac/srx/ii-2009-2012/remont/mechanical/#engine-mechanical-28l-or-30l-diagnostic-information-and-procedures__engine-will-not-crank-crankshaft) .
Test for less than 0.5 V between the positive battery cable and terminal A X2 at the M64 starter motor as the S39 ignition switch is placed to the START position. If greater than the specified value, replace the positive battery cable.
Test for less than 0.5 V between the negative battery cable and the starter motor case as the S39 ignition switch is placed to the START position. If greater than the specified value, replace the negative battery cable.
If all circuits test normal, replace the M64 starter motor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Battery Positive and Negative Cable Replacement (LF1)»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Positive and Negative Cable Replacement (LAU)»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system)
«Battery Negative Cable Replacement»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system)
«Starter Replacement (LF1)»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system) or «Starter Replacement (LAU)»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system)

Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
«Wiring Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12.0-15.0 V. If not within the specified range, refer to «Battery Charging»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system) .
Remove the drive belts. Refer to «Drive Belt Tensioner Replacement»(/cadillac/srx/ii-2009-2012/remont/mechanical/#engine-mechanical-28l-or-30l-repair-instructions-on-vehicle-1-of-2) , «Drive Belt Idler Pulley Replacement»(/cadillac/srx/ii-2009-2012/remont/mechanical/#engine-mechanical-28l-or-30l-repair-instructions-on-vehicle-1-of-2) or «Drive Belt Replacement»(/cadillac/srx/ii-2009-2012/remont/mechanical/#engine-mechanical-28l-or-30l-repair-instructions-on-vehicle-1-of-2) .
Place the S39 ignition switch to the CRANK position. If the engine cranks normal, inspect the engine and belt drive system for mechanical binding, seized engine, or seized generator, etc.
Test for less than 0.5 V between the positive battery cable and terminal A X2 at the M64 starter motor as the S39 ignition switch is placed to the CRANK position. If greater than the specified value, replace the positive battery cable.
Test for less than 0.5 V between the negative battery cable and the starter motor case as the S39 ignition switch is placed to the CRANK position. If greater than the specified value, replace the negative battery cable.
If all circuits test normal, replace the M64 starter motor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Battery Positive and Negative Cable Replacement (LF1)»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Positive and Negative Cable Replacement (LAU)»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system)
«Battery Negative Cable Replacement»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system)
«Starter Replacement (LF1)»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system) or «Starter Replacement (LAU)»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system)

Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The PG starter motors are non-repairable. They have pole pieces that are arranged around the armature. Both solenoid windings are energized. The pull-in winding circuit is completed to the ground through the starter motor. The windings work together magnetically to pull and hold in the plunger. The plunger moves the shift lever. This action causes the starter drive assembly to rotate on the armature shaft spline as it engages with the flywheel ring gear on the engine. Moving at the same time, the plunger also closes the solenoid switch contacts in the starter solenoid. Full battery voltage is applied directly to the starter motor and it cranks the engine.

Description and Operation