Battery, Charging System and Starting System Cadillac ATS I

Connector End View Reference

Stop/Start System Description and Operation

Description and Operation

Electrical Information Reference

«Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/ats/i-2012-2014/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

Ignition ON.
Verify the ECO switch indicator turns ON and OFF when commanding the Start/Stop Select Switch Indicator Active and Inactive with a scan tool. If the ECO switch indicator does not turn ON and OFF Refer to Circuit/System Testing. If the ECO switch indicator turns ON and OFF
All OK.

Circuit/System Testing

Ignition OFF, disconnect the harness connector at the S48A Multifunction Switch 2 - Instrument Panel, ignition ON.
Connect a test lamp between the control circuit terminal 4 and B+.
Verify the test lamp turns ON and OFF when commanding the Start/Stop Select Switch Indicator Active and Inactive with a scan tool. If the test lamp is always ON Ignition OFF, disconnect the harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If the test lamp is always OFF Ignition OFF, disconnect the harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp illuminates
Test or replace the S48A Multifunction Switch 2 - Instrument Panel.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

«Instrument Panel Multifunction Switch Replacement»(/cadillac/ats/i-2012-2014/remont/gauges-instrument-panels/#instrument-panel-system-displays-and-gauges)
«Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for body control module replacement, programming, and setup

Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/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/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The vehicle control modules or sensors monitor the system voltage to verify the system voltage is within the normal operating range.

The engine is running.

The control module or sensor detects a system voltage of less than approximately 9 V or greater than 18 V for approximately 5 s.

A driver information center message and/or warning indicator may be displayed.
The control module may be temporarily disabled.

The system voltage returns to normal operating range.

Diagnostic Aids

A high or low voltage DTC set or voltage value in multiple modules/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

Connector End View Reference

«COMPONENT CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
«Inline Harness Connector End Views»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-x338-to-x805)

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/ats/i-2012-2014/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, measure and record the battery voltage at the battery terminals.
Verify the battery voltage stabilizes between 12.4 and 12.8 V within a few minutes of turning the ignition OFF. If battery voltage is less than 12.4 V or more than 12.8 V Refer to «Battery Inspection/Test»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system) . If battery voltage is between 12.4 and 12.8 V
Engine running, headlights ON, measure and record the battery voltage at the battery terminals.
Verify the voltage is at least 1 V greater than the voltage measured in step 1, but less than 15 V. If the voltage is not at least 1 V greater than the voltage measured in step 1 or is greater than 15 V. Refer to «Charging System Test»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system) . If the voltage is at least 1 V greater than the voltage measured in step 1, but less than 15 V.
Verify the appropriate control module scan tool battery voltage and ignition voltage parameters are within 1 V of the battery voltage. If not within 1 V of the battery voltage Refer to Circuit/System Testing. If within 1 V of the battery voltage
All OK.

Note. Use the schematic to identify the following: Control modules the vehicle is equipped with The control module's ground, B+, and Ignition circuit terminal IDs and connectors

Note. Some control module ground circuits may require up to 20 min after the ignition is turned off before achieving a resistance reading of less than 5 ohms. In most cases the readings will drop below 20 ohms within 1 min indicating the control module is going to sleep.

Ignition OFF and all vehicle systems OFF, disconnect the harness connectors at the appropriate control module. It may take up to 2 min for all vehicle systems to power down.
Test for less than 10 ohms between each ground circuit terminal and ground. If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
If equipped, verify a test lamp illuminates between each B+ circuit terminal and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition OFF. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF. Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the appropriate control module. If the test lamp illuminates
Ignition ON.
If equipped, verify a test lamp illuminates between each ignition circuit terminal and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition OFF. Test for less than 2 ohms in the ignition circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF. Test for infinite resistance between the ignition circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the appropriate control module. If the test lamp illuminates
Replace the control module.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for control module replacement, programming and setup

Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/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/ats/i-2012-2014/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 B18 Battery Current Sensor is a 3-wire hall effect current sensor. The body control module (BCM) supplies 5 V and ground to the B18 Battery Current Sensor. The B18 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.

B1516 08

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

B1516 66

The battery current polarity is positive for 2 min.

The regulated voltage control is disabled.

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

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

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

B1516 08

Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B18 Battery Current Sensor. It may take up to 2 min for all vehicle systems to power down.
Test for less than 10 ohms between the low reference circuit terminal B and ground. If 10 ohms or greater Ignition OFF, disconnect the X5 harness connector at the K9 Body Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If less than 10 ohms
Ignition ON.
Test for 4.8-5.2 V between the 5 V reference circuit terminal A and ground. If less than 4.8 V Ignition OFF, disconnect the X4 harness connector at the K9 Body Control Module. Test for infinite resistance between the 5 V reference circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the 5V reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If greater than 5.2 V Ignition OFF, disconnect the X4 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the 5 V reference circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If between 4.8-5.2 V
Test for 4.8-5.2 V between the signal circuit terminal C and ground. If less than 4.8 V Ignition OFF, disconnect the X4 harness connector at the K9 Body Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If greater than 5.2 V Ignition OFF, disconnect the X4 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If between 4.8-5.2 V
Test or replace the B18 Battery Current Sensor.

B1516 66

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 B18 Battery Current Sensor properly. If the B18 Battery Current Sensor is installed correctly
Replace the B18 Battery Current Sensor.

Perform the Diagnostic Repair Verification after completing the repair.

«Battery Negative Cable Replacement»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system)
«Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for K9 Body Control Module replacement, programming and setup.

Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/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/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The body control module (BCM) monitors the battery voltage level during an engine crank event to detect a low battery voltage condition.

The vehicle is ON

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

A driver information center 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/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Verify DTC P0621 or P0622 is not set. If DTC P0621 or P0622 is set Refer to «DTC P0621»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system) , or «DTC P0622»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system) If DTC P0621 or P0622 is not set
Perform the «Battery Inspection/Test»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system) .

Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/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/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provide an overview of each diagnostic category.

DTC Descriptor

For symptom byte information, refer to Symptom Byte List .

The battery sensor module is attached directly to the negative battery terminal and is used to determine the battery condition by calculating the battery state of charge, state of function, and state of health. The battery condition is used to help determine if the 12 volt stop/start system will allow a stop/start event to occur when the vehicle has come to a stop.

The engine is not running.
This diagnostic runs every 50 ms.

The battery sensor module has an internal malfunction.
The BCM detects the battery sensor module is not programmed.

Start/stop is disabled.

The conditions for setting the DTC are no longer present.

DTC B151C may set if a battery charger is used.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

B151C 39

Ignition ON.
Verify DTC B151C 39 is not set. If the DTC is set Replace the B110 Battery Sensor Module., «Battery Sensor Replacement (KL9)»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system) If the DTC is not set
All OK.

B151C 42

Ignition ON.
Verify DTC B151C 42 is not set. If the DTC is set Perform the «Battery Sensor Module Calibration»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system__battery-sensor-module-calibration) procedure. Verify the DTC does not set while operating the vehicle within the Conditions for Running the DTC. If the DTC sets, replace the B110 Battery Sensor Module, «Battery Sensor Replacement (KL9)»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system) . If the DTC does not set. All OK. If the DTC is not set
All OK.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for battery sensor module replacement, programming, and setup

Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/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/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The vehicle control modules or sensors monitor the system voltage to verify the system voltage is within the normal operating range.

The ignition is ON.

The control module or sensor detects a system voltage of less than approximately 9 V for approximately 5 s.

A driver information center message and/or warning indicator may be displayed.
The control module may be temporarily disabled.

The system voltage returns to normal operating range.

A high or low voltage DTC set or voltage value in multiple modules/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

Connector End View Reference

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/ats/i-2012-2014/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, measure and record the battery voltage at the battery terminals.
Verify the battery voltage stabilizes between 12.4 and 12.8 V within a few minutes of turning the ignition OFF. If battery voltage is less than 12.4 V or more than 12.8 V Refer to «Battery Inspection/Test»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system) . If battery voltage is between 12.4 and 12.8 V
Engine running, headlights ON, measure and record the battery voltage at the battery terminals.
Verify the voltage is at least 1 V greater than the voltage measured in step 1, but less than 15 V. If the voltage is not at least 1 V greater than the voltage measured in step 1 or is greater than 15 V. Refer to «Charging System Test»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system) . If the voltage is at least 1 V greater than the voltage measured in step 1, but less than 15 V.
Verify the appropriate control module scan tool B+ and ignition voltage parameters are within 1 V of the battery voltage. If not within 1 V of the battery voltage Refer to Circuit/System Testing. If within 1 V of the battery voltage
All OK.

Note. Use the schematic to identify the following: Control modules the vehicle is equipped with The control module's ground, B+, and Ignition circuit terminal IDs and connectors

Ignition OFF and all vehicle systems OFF, disconnect the harness connectors at the appropriate control module. It may take up to 2 min for all vehicle systems to power down.
Test for less than 10 ohms between each ground circuit terminal and ground. If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
If equipped, verify a test lamp illuminates between each B+ circuit terminal and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition OFF. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF. Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the appropriate control module. If the test lamp illuminates
Ignition ON.
If equipped, verify a test lamp illuminates between each ignition circuit terminal and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition OFF. Test for less than 2 ohms in the ignition circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF. Test for infinite resistance between the ignition circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the appropriate control module. If the test lamp illuminates
Replace the control module.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for control module replacement, programming and setup

Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/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/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The body control module (BCM) monitors the state of charge of the electrical system.

The ignition is in Accessory or Run mode.

The state of charge at ignition ON is 30% 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%.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/ats/i-2012-2014/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/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/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/ats/i-2012-2014/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
Relay Switch B+ Terminal 30	1	2
Relay Coil Ignition Terminal 85	P0616	P0615	P0617
Relay Switch Control Terminal 87	2	2	3
Relay Coil Ground Terminal 86		P0615
1. Opens fuse, Starter Solenoid does not click. 2. Starter Solenoid does not click. 3. Cranks all the time.

When the ignition is activated to start the vehicle, a discrete signal is supplied to the body control module (BCM). 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 pressed 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 activated to START.
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/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/ats/i-2012-2014/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 and all vehicle systems OFF, disconnect the KR27 Starter Relay. It may take up to 2 min for all vehicle systems to power down.
Test for less than 10 ohms between the ground circuit terminal 86 and ground. If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
Ignition ON.
Verify a test lamp illuminates between the B+ circuit terminal 30 and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition OFF. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is good and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF. Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, Test for infinite resistance between the control circuit terminal 87 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the M64 Starter Motor. If the test lamp illuminates
Connect a test lamp between the control circuit terminal 85 and the ground circuit terminal 86. NOTE: If the Starter Relay command is not available in the scan tool, verify the test lamps turns on and off when cycling the ignition between the OFF and CRANK position with the parking brake set and clutch pedal pressed (manual transmission) or the transmission in park (automatic transmission).
Verify the test lamp turns ON and OFF when commanding the Starter Relay ON and OFF with a scan tool. If the test lamp is always OFF Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If the test lamp is always ON Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If the test lamp turns ON and OFF
Ignition ON, connect a 30 A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87.
Verify the M64 Starter Motor is activated. If the M64 Starter Motor does not activate Ignition OFF, disconnect the harness connector at the M64 Starter Motor. Test for infinite resistance between the control circuit terminal X1 A or X1 1 and ground.. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the M64 Starter Motor. If the M64 Starter Motor activates
Test or replace the KR27 Starter Relay.

Component Testing

Relay Test

Ignition OFF, disconnect the KR27 Starter Relay.
Test for 60-180 ohms between terminals 85 and 86. If less than 60 or greater than 180 ohms Replace the relay. If between 60-180 ohms
Test for infinite resistance between the terminals listed below: 30 and 86 30 and 87 30 and 85 85 and 87 If less than infinite resistance Replace the relay. If infinite resistance
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 2 ohms or greater Replace the relay. If less than 2 ohms
All OK

Perform the Diagnostic Repair Verification after completing the repair.

«Relay Replacement (Within an Electrical Center)»(/cadillac/ats/i-2012-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions__relay-replacement-within-an-electrical-center) , «Relay Replacement (Attached to Wire Harness)»(/cadillac/ats/i-2012-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
«Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, programming, and setup.

Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/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/ats/i-2012-2014/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 - L Terminal	P0621	P0621	P0621
Signal - F Terminal	P0622	P0622	P0622	P0622

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 duty cycled voltage to the voltage regulator. The duty cycle 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 the 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 on the generator turn on control circuit, a high voltage when the duty cycle voltage is commanded high, and a low voltage when the duty cycle voltage is commanded low.

Ignition ON, engine OFF (Prior to Ignition ON, the ignition must have been OFF for at least 5 s).
The engine is running for the run test.

Ignition ON, engine OFF - The ECM detects greater than 3.5 V on the generator control circuit for 5 s.
Engine running - The ECM detects a low voltage for 15 s on the generator control circuit when the duty cycle voltage is commanded high.
Engine running - The ECM detects a high voltage for 15 s on the generator control circuit when the duty cycle voltage is commanded low.

DTC P0621 is a type C DTC.

Ignition ON, engine OFF- Low voltage.
Engine running - A control signal duty cycle is detected.

Schematic Reference

Connector End View Reference

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/ats/i-2012-2014/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

Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
All OK.

Verify a test lamp illuminates between the G13 Generator B+ circuit terminal A X2, B X2 or 1 X2, and ground. If the test lamp does not illuminate and the circuit fuse is good Remove the test lamp and disconnect the B+ cable at the G13 Generator. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Remove the test lamp, disconnect the battery negative cable, and disconnect the G13 Generator B+ cable. Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If the test lamp illuminates
Disconnect the X1 harness connector at the G13 Generator, ignition ON.
Test for 1 V or greater between the control circuit terminal 1 X1 and ground. If less than 1 V Ignition OFF, disconnect the harness connectors at the K20 Engine Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If greater than 2 ohms, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If 1V or greater
Ignition OFF, disconnect the harness connectors at the K20 Engine Control Module, Ignition ON.
Test for less than 1 V between the G13 Generator control circuit terminal 1 X1 and ground. If greater than 1 V Repair the short to voltage on the circuit. If 1V or less
Test or replace the G13 Generator.

Perform the Diagnostic Repair Verification after completing the repair.

«Generator Replacement (LCV)»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system) , «Generator Replacement (LFX)»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system) , «Generator Replacement (LTG)»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system)
«Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for engine control module replacement, programming, and setup

Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/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/ats/i-2012-2014/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 - L Terminal	P0621	P0621	P0621
Signal - F Terminal	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%. When the engine is running, the duty cycle should be between 5-99%.

Ignition ON, engine OFF (Prior to Ignition ON, the ignition must have been OFF for at least 5 s)
Engine running at less than 3,000 RPM

DTC P0621 is not set
Ignition ON, engine OFF (Prior to Ignition ON, the ignition must have been OFF for at least 5 s), the ECM detects a PWM signal that is greater than 65% for 5 s
Engine running at less than 3,000 RPM-The ECM detects a PWM signal that is less than 5% for 30 s

DTC P0622 is a type C DTC

Ignition ON, Engine OFF- Low / no PWM signal detected
Engine running - A 5-90% duty cycle is detected

Schematic Reference

Connector End View Reference

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/ats/i-2012-2014/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

Note. Do not have a battery charger connected during the generator testing.

Engine running.
Verify the scan tool Engine Control Module Generator F-Terminal Signal parameter is between 5-90%. If not between 5-90% Refer to Circuit/System Testing. If between 5-90%
Verify the scan tool Generator F-Terminal Signal parameter changes when commanding the headlamps ON and OFF. If the parameter does not change Refer to Circuit/System Testing. If the parameter changes
Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
All OK.

Verify a test lamp illuminates between the G13 Generator B+ circuit terminal A X2, B X2 or 1 X2, and ground. If the test lamp does not illuminate and the circuit fuse is good Remove the test lamp and disconnect the B+ cable at the G13 Generator. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Remove the test lamp, disconnect the battery negative cable, and disconnect the G13 Generator B+ cable. Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If the test lamp illuminates
Disconnect the X1 harness connector at the G13 Generator, engine running.
Verify the scan tool Engine Control Module Generator F-Terminal Signal parameter is less than 5%. If 5% or greater Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON. Test for less than 1 V between the signal circuit terminal 2 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If less than 5%
Install a 3 A fused jumper wire between the signal circuit terminal 2 and B+, engine running.
Verify the scan tool Engine Control Module Generator F-Terminal Signal parameter is greater than 95%. If 95% or less Ignition OFF, remove the jumper wire, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit If less than 2 ohms, replace the K20 Engine Control Module. If greater than 95%
Test or replace the G13 Generator.

Perform the Diagnostic Repair Verification after completing the repair.

«Generator Replacement (LCV)»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system) , «Generator Replacement (LFX)»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system) , «Generator Replacement (LTG)»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system)
«Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for engine control module replacement, programming, and setup

Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/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/ats/i-2012-2014/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
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 3000 RPM.

P0626

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

P0625

The ECM detects a PWM signal less than 5% for 15 s.

P0626

The ECM detects a 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/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/ats/i-2012-2014/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.
Verify the scan tool Generator F-Terminal Signal Circuit parameter changes between 5 and 99%. If the parameter does not change Refer to Circuit/System Testing. If the parameter changes
All OK.

Verify a test lamp illuminates between the G13 Generator B+ circuit terminal A X2, B X2 or 1 X2, and ground. If the test lamp does not illuminate and the circuit fuse is good Disconnect the B+ cable at the G13 Generator. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the G13 Generator. If the test lamp illuminates
Ignition OFF, disconnect the X1 harness connector at the G13 Generator.
Verify the scan tool ECM Generator F-Terminal Signal parameter is less than 5%. If 5% or greater Ignition ON. Test for less than 1 V between the signal circuit terminal 2 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If less than 5%
Install a 3 A fused jumper wire between the signal circuit terminal 2 and B+.
Verify the scan tool ECM Generator F-Terminal Terminal Signal parameter is greater than 95%. If 95% or less Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K20 Engine Control Module. If greater than 95%.
Replace the G13 Generator.

Perform the Diagnostic Repair Verification after completing the repair.

«Generator Replacement (LCV)»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system) , «Generator Replacement (LFX)»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system) , «Generator Replacement (LTG)»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system)
«Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, programming, and setup

Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/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/ats/i-2012-2014/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
Control	P15A2		P15A2

The body control module (BCM) signal circuit is pulled to ground when the ECO button is suppressed.

The ignition is ON.
The DTCs run continuously once the above condition is met.

The BCM detects either a short to ground or short to voltage in the multifunction switch control signal circuit for more than 60 s.

DTC P15A2 00 is a Type C DTC.

Schematic Reference

Connector End View Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Engine Controls Schematics (LTG) , Engine Controls Schematics (LCV)

Ignition ON
Verify with a scan tool that no DTC is set in the BCM. If any DTC is set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) If no DTC is set
Verify the scan tool Stop/Start Select Switch parameter changes between Active and Inactive when pressing and releasing the ECO switch. If the parameter does not change Refer to Circuit/System Testing If the parameter changes
All OK.

Ignition OFF, disconnect the harness connector at the S48A Multifunction Switch 2- Instrument Panel ignition ON.
Verify the scan tool Stop/Start Select Switch parameter is Inactive. If not Inactive Ignition OFF, disconnect the harness connector at the K9 Body Control Module. Test for infinite resistance between the signal circuit terminal 10 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If Inactive
Install a 3 A fused jumper wire between the signal circuit terminal 10 and ground.
Verify the scan tool Stop/Start Select Switch parameter is Active. If not Active Ignition OFF, disconnect the harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Ignition OFF. Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance on the circuit. If less than 2 ohms, replace the K9 Body Control Module. If Active
Test or replace the S48A Multifunction Switch 2- Instrument Panel.

Perform the Diagnostic Repair Verification after completing the repair.

«Instrument Panel Multifunction Switch Replacement»(/cadillac/ats/i-2012-2014/remont/gauges-instrument-panels/#instrument-panel-system-displays-and-gauges)
«Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for Body Control Module replacement, programming and setup.

Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/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/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The engine control module (ECM) receives the Stop/Start switch speed signal via CAN from the body control module (BCM).

The ignition is ON.
The DTCs run continuously once the above condition is met.

The ECM receives an invalid Stop/Start switch status serial data message from the BCM.

DTC P15A3 00 is a Type C DTC.

Schematic Reference

Connector End View Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Stop/Start System Malfunction

Ignition ON
Verify with a scan tool that no DTC is set in the BCM. If any DTC is set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) If no DTC is set
Verify with a scan tool the Engine Control Module Stop/Start Select Switch parameter changes between Yes and No while pressing the Stop/Start switch. If the parameter does not change Refer to Circuit/System Testing If the parameter changes
All OK.

Ignition OFF, disconnect the harness connector at the S48A Multifunction Switch 2 - Instrument Panel.
Test for less than 10 ohms between the ground circuit terminal 1 and ground. If 10 ohms or greater Ignition OFF. Test for less than 2 ohms at the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
Ignition ON, verify with a scan tool the Engine control Module Stop/Start Select Switch parameter is No. If the parameter is YES Ignition OFF, disconnect the harness connector X2 at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground at the circuit. If infinite resistance, replace the K9 Body Control Module. If the parameter is NO
Install a 3 A fused jumper wire between the signal circuit terminal 10 and ground. Verify the ECM scan tool Stop/Start Select Switch parameter is Yes. If the parameter is NO Ignition OFF. Disconnect the harness connector X2 at the K9 Body Control Module. Test for less than 1 V the control circuit and ground. If greater than 1 V, repair the short to voltage. If less than 1 V, replace the K9 Body Control Module. If the parameter is YES
Replace the S48A Multifunction Switch 2 - Instrument Panel.

Perform the Diagnostic Repair Verification after completing the repair.

«Instrument Panel Multifunction Switch Replacement»(/cadillac/ats/i-2012-2014/remont/gauges-instrument-panels/#instrument-panel-system-displays-and-gauges)
«Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for Body Control Module replacement, programming and setup.

Symptoms - Engine Electrical

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

Perform «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) before using the Symptom Tables in order to verify that all of the following are true: 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/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system__battery-description-and-operation) «Charging System Description and Operation»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system) «Electrical Power Management Description and Operation»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system) «Starting System Description and Operation»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system__starting-system-description-and-operation)

Visual/Physical Inspection

Inspect for aftermarket devices which could affect the operation of the starting and charging systems. Refer to «Checking Aftermarket Accessories»(/cadillac/ats/i-2012-2014/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/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system)
«Battery Electrical Drain/Parasitic Load Test»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system)
«Charging System Test»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system)
«Generator Noise Diagnosis»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system)
«Starter Solenoid Does Not Click»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system)
«Starter Solenoid Clicks, Engine Does Not Crank»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system)
«Engine Cranks Slowly»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system)
«Starter Noise Diagnosis»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system)

Symptoms - Stop/Start System

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

Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) before using the symptom tables in order to verify that all of the following are true: There are no DTCs set. The control modules can communicate via the serial data link.
Review the system description and operation in order to familiarize yourself with the system functions. Refer to «Stop/Start System Description and Operation»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system__stopstart-system-description-and-operation) .

Inspect for aftermarket devices which may affect the operation of the Stop/Start System. Refer to «Checking Aftermarket Accessories»(/cadillac/ats/i-2012-2014/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 may cause the symptom.

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

Refer to a symptom diagnostic procedure to diagnose the symptom

Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/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/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Note. For Warranty repairs - You must use regionally required battery test equipment for warranty repairs. For accurate test results the battery must be disconnected from the vehicle and the equipment connected directly to the battery posts. When setting up the equipment, select "Out of Vehicle" and then the correct battery type (Flooded or AGM) and rated CCA (both from the battery label) must be entered. 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 (both batteries disconnected with test equipment connected directly to the post) 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 battery tester clips on the terminal. This may cut through any coating or through any oxidation that may be present on the terminal.
If correct connections to the battery terminals in the vehicle are in doubt, perform the following steps: Disconnect the negative battery cable. Disconnect the positive battery cable. 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. NOTE: Always write the test code displayed by the tester on the repair order for any warranty purposes. The number is a unique code that describes the test data for a particular battery at a particular time. The test code may occasionally repeat when you retest the same battery. More often, each test will result in a different code. Use the test code from the second, or Out of Vehicle test. Follow the instructions for testing a removed battery. Replace the battery only if the second test shows a REPLACE BATTERY or BAD CELL-REPLACE result. Use the test code from the second test for any warranty purposes.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/ats/i-2012-2014/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 50313 Battery Tester

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 should be allowed to time out or be disabled (simply opening the driver door should disable retained accessory power) before disconnecting power. Disconnecting power to the OnStar® module in any way while the ignition is On or with retained accessory power activated may cause activation of the OnStar® Back-Up Battery 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 back-up battery is not rechargeable and once activated the back-up battery must be replaced.

Verify the C1 or C1B Battery case is not cracked, broken, or damaged, which may be indicated by battery acid leakage. If there is any apparent damage Replace the C1 or C1B Battery. If there is no damage
Verify the cold cranking amperage and amperage hour rating of the C1 or C1B Battery. Refer to the manufacturer specifications on the battery label. If the C1 or C1B Battery does not meet specifications Replace the C1 or C1B Battery. If the C1 or C1B Battery meets specifications
Verify that the battery cables are clean and tight. The battery terminal bolts should be torqued as specified in «Fastener Tightening Specifications»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system__fastener-tightening-specifications) . If the battery cables need to be cleaned or tightened Clean as required and tighten as specified. If the battery cables are clean and tight
Install the battery tester and follow directions supplied by the tester.

Perform the Diagnostic Repair Verification after completing the repair.

Battery Replacement

12 V Battery

The following procedure is for the 12 V battery only.

Special Tools

EL 50313 Midtronics GR8 Battery Tester Charger

For equivalent regional tools, refer to Special Tools .

This vehicle is equipped with an Absorbent Glass Matt Battery. This type of battery requires different charging and testing parameters than the more common regular flooded lead acid type battery. ANY time you perform charging and or testing you MUST set up the charging/testing equipment or permanent damage to the battery may result.

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 50313 before charging.
The maximum permissible voltage is 14.8 V (at room temperature) for the absorbent glass mat battery equipped on this vehicle.

Battery State of Charge

Note. Using voltage to determine the battery's 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 battery's 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

Torque the battery side terminal adapters to 15 (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/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system) .

The following procedure is for the 12 V battery only.

Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/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/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Components most likely to cause a parasitic draw on the vehicles 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. 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 may 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/ats/i-2012-2014/remont/body-electrical/#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/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system) , and «Charging System Test»(/cadillac/ats/i-2012-2014/remont/body-electrical/#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, 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/ats/i-2012-2014/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 min. The typical current draw for this is about 1 A.
Digital OnStar Generation 6 and later vehicle communication interface module do not "wake up" every 10 minutes for the first 48 hours as the Generation 5 and prior. Generation 6 and later vehicle communication interface module current draw is very low, less than 40 mA, so the OnStar system is left in that state for up to the first 48 h. Parasitic draw of up to 40 mA with an occasional spike as high as 80 mA through the vehicle communication interface module 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 body control module for monitoring purposes, actual system wake up only occurs when the fobs for the vehicle are used. When other devices on the same remote keyless entry operating frequency are activated, such as the 4 tire pressure monitoring sensors and other vehicle Fobs in the vicinity, the body control module 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 remote keyless entry 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 may be longer. If the reserve capacity is lower, then the battery run down time may be shorter. The graph below indicates roughly how many days a 690 cold cranking amperage 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/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Wiring Repairs»(/cadillac/ats/i-2012-2014/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 min, 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 s. 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 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 Head lamps OFF - auto head lamps 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 min 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.

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/ats/i-2012-2014/remont/body-electrical/#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. 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.

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 following 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 repair.

Control Module References for control module replacement, programming and setup

Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/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/ats/i-2012-2014/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 - L Terminal	P0621	P0621	P0621
Signal - F Terminal	P0622	P0622	P0622	P0622

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 duty cycled voltage to the voltage regulator. The duty cycle 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 the 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 when the duty cycle voltage is commanded high and a low voltage when the duty cycle voltage is commanded low on the generator turn on control circuit.

Schematic Reference

Connector End View Reference

Description and Operation

Generator Replacement (LCV) , Generator Replacement (LFX) , Generator Replacement (LTG)

Electrical Information Reference

«Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Note. Do not have a battery charger connected during the generator testing.

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/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . If no DTCs are set
Verify the scan tool Body Control Module Battery Voltage parameter is 12 V or greater. If less than 12 V Refer to «Battery Inspection/Test»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system) . If 12 V or greater
Engine running, all accessories OFF.
Verify the scan tool Body Control Module Battery Voltage parameter continually increases when controlling the Body Control Module Generator Regulator Setpoint from 10% to 80% with a scan tool. It may take up to 10 s for the battery voltage to stabilize between each setpoint change. If the battery voltage does not continually increase Refer to Circuit/System Testing. If the battery voltage continually increases
All OK.

Note. You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

Ignition OFF.
Test for less than 2 ohms between the G13 Generator housing and C1 Battery negative terminal. If 6.5 ohms or greater Repair the open/high resistance in the circuit. If less than 6.4 ohms
Verify a test lamp illuminates between the G13 Generator B+ circuit terminal A X2, B X2 or 1 X2 and ground. If the test lamp does not illuminate and the circuit fuse is good Remove the test lamp and disconnect the B+ cable at the G13 Generator. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Remove the test lamp, disconnect the C1 Battery negative cable, and disconnect the G13 Generator B+ cable. Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If the test lamp illuminates
Test or replace the G13 Generator.

Perform the Diagnostic Repair Verification after completing the repair.

Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/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/ats/i-2012-2014/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 incorrectly routed 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. If all belt driven components spin freely
Start the engine. Operate the engine for no longer than 30-40 seconds.
Verify that the noise is no longer present. If the noise is still present The generator is not the cause of the noise. Refer to «Symptoms - Engine Mechanical (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-diagnostic-information-and-procedures) , «Symptoms - Engine Mechanical (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-diagnostic-information-and-procedures) , for 2.0L (LTG) or 2.5L (LCV) engines or «Symptoms - Engine Mechanical»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-36l-lfx-diagnostic-information-and-procedures) for 3.6L (LFX) engine. If noise is no longer present
Inspect for worn accessory drive components or abnormalities such as severe cracking, bumps, or missing areas in the accessory drive belt and/or misalignment of system components

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Drive Belt Replacement»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-repair-instructions-on-vehicle) for the 2.0L (LTG) or 2.5L (LCV) engines
«Drive Belt Tensioner Replacement»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-repair-instructions-on-vehicle) for the 2.0L (LTG) or 2.5L (LCV) engines
«Drive Belt Replacement»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-36l-lfx-repair-instructions-on-vehicle) for the 3.6L (LFX) engine
«Drive Belt Tensioner Replacement»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-36l-lfx-repair-instructions-on-vehicle) for the 3.6L (LFX) engine
«Generator Replacement (LCV)»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system) , «Generator Replacement (LFX)»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system) , «Generator Replacement (LTG)»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system)

Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/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/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The 12 volt start/stop system is used to reduced fuel consumption and emissions by automatically turning off the engine when coming to a stop and restarting when moving again. When coming to a stop with the transmission in neutral and the clutch pedal released, assuming no disable conditions exist, the engine will automatically turn off at 3 km/h. The engine will automatically restart when the driver presses the clutch pedal.

The 12 volt start/stop system can be enabled or disabled by the driver using the ECO switch. The body control module applies voltage to the switch signal and monitors the voltage. When the ECO switch is pressed, the signal circuit is pulled to ground and voltage at the body control module is low, indicating the switch has been pressed. The body control module also controls the ECO switch indicator. When the 12 volt start/stop system is enabled by the driver, the body control module will illuminate the indicator by providing ground to the indicator control circuit.

To eliminate unwanted infotainment system effects during engine cranking, the 12 volt start/stop system utilizes a power supply transformer that provides a steady B+ to the infotainment system though the battery saver relay. During engine cranking, system voltage may momentarily drop below 10 volts. This momentary drop in voltage may cause the vehicle infotainment to turn off and restart during a start/sop event. The power supply transformer maintains steady B+ to the infotainment system to prevent system an infotainment restart during cranking.

The 12 volt start/stop system may be disabled for the following reasons

Disabled by driver using the ECO switch
Hood is ajar
Driver door is ajar and driver seat belt is unbuckled
Brake vacuum is 45 kPa or less
Battery state of charge too low
Battery state of health too low
Battery state of function too low
Battery voltage is 12 V or less
Idle boost is request
A/C compressor is requested
Relevant DTCs are set in the engine control module
Coolant temperature is 120° C or greater
Ambient air temperature and coolant temperature is too low
Calculated battery temperature is less than 0° C or greater than 55° C
Transmission is in gear
Clutch is released
Vehicle speed is 5 kph or greater

Schematic Reference

Connector End View Reference

Stop/Start System Description and Operation

Description and Operation

Electrical Information Reference

«Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/ats/i-2012-2014/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.
Test for greater than 12 V between the battery positive terminal and negative terminal. If 12 V or less Refer to «Battery Inspection/Test»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system) . If greater than 12 V
Verify there are no DTCs set in the engine control module. If any DTCs are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . If no DTCs are set
Verify the scan tool Stop/Start Select Switch parameter changes between Active and Inactive when pressing and releasing the ECO switch. If the parameter does not change Refer to Circuit/System Testing - ECO Switch Circuit Malfunction If the parameter changes
Verify the ECO switch indicator turns ON and OFF when commanding the Start/Stop Select Switch Indicator Active and Inactive with a scan tool. If the ECO switch indicator does not turn ON and OFF Refer to Circuit/System Testing - ECO Switch Indicator Circuit Malfunction If the ECO switch indicator turns ON and OFF
Verify the autostop and autostart functions are functioning properly while operating the vehicle under the conditions for entering a start/stop event. If the vehicle does not autostop or autostart Observe the scan tool Autostop Disable Reason, Autostop Inhibit, Autostart Inhibit, and Autostart Entry parameters while operating the vehicle under the conditions for entering a start/stop event. These parameters will identify the specific cause for the autostop or autostart disable. Refer to the appropriate subsection and symptom when the cause is identified using the scan tool parameters. If the vehicle autostops and autostarts
Verify the infotainment system remains active during a start/stop event. If the infotainment system turns off or restarts during a start/stop event. Refer to Circuit/System Testing - Power Supply Transformer Circuit Malfunction If the infotainment system remains active during a start/stop event
All OK.

ECO Switch Circuit Malfunction

Ignition OFF, disconnect the harness connector at the S48A Multifunction Switch 2 - Instrument Panel ignition ON.
Verify the scan tool Stop/Start Select Switch parameter is Inactive. If not Inactive Ignition OFF, disconnect the harness connector at the K9 Body Control Module. Test for infinite resistance between the signal circuit terminal 10 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If Inactive
Install a 3 A fused jumper wire between the signal circuit terminal 10 and ground.
Verify the scan tool Stop/Start Select Switch parameter is Active. If not Active Ignition OFF, disconnect the harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Ignition OFF. Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance on the circuit. If less than 2 ohms, replace the K9 Body Control Module. If Active
Test or replace the S48A Multifunction Switch - Instrument Panel.

ECO Switch Indicator Circuit Malfunction

Ignition OFF, disconnect the harness connector at the S48A Multifunction Switch 2 - Instrument Panel ignition ON.
Connect a test lamp between the control circuit terminal 4 and B+.
Verify the test lamp turns ON and OFF when commanding the Start/Stop Select Switch Indicator Active and Inactive with a scan tool. If the test lamp is always ON Ignition OFF, disconnect the harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If the test lamp is always OFF Ignition OFF, disconnect the harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance on the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp turns ON and OFF
Test or replace the S48A Multifunction Switch - Instrument Panel.

Power Supply Transformer Circuit Malfunction

Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the T19 Power Supply Transformer. It may take up to 2 min for all vehicle systems to power down.
Test for less than 10 ohms between the ground circuit terminal 1 and ground. If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
Ignition ON.
Verify a test lamp illuminates between the B+ circuit terminal 2 and ground. If the test amp does not illuminate and the circuit fuse is good Ignition OFF. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF. Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for infinite resistance between the T19 Power Supply Transformer control circuit terminal 4 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, test or replace the T19 Power Supply Transformer. If the test lamp illuminates
Verify a test lamp illuminates between the ignition circuit terminal 5 and ground. If the test lamp does not illuminate Ignition OFF. Test for infinite resistance between the ignition circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, verify there is voltage at the fuse. Refer to «Power Mode Mismatch»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures) . If the test lamp illuminates
Install a test lamp between the control circuit terminal 6 and ground.
Verify the test lamp illuminates while cranking the engine. If the test lamp does not illuminate Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module. Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, refer to «Starter Solenoid Does Not Click»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system) . If the test lamp illuminates
Test or replace the T19 Power Supply Transformer.

Perform the Diagnostic Repair Verification after completing the repair.

Instrument Panel Multifunction Switch Replacement

Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/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/ats/i-2012-2014/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
Relay Coil Control Terminal 85		1	3
Starter 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 crank position, a discrete signal is supplied to the body control module (BCM) notifying it that the ignition is in the crank 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 motor.

Schematic Reference

«Starting and Charging Schematics»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system)
«Automatic Transmission Controls Schematics»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-schematic-wiring-diagrams) for the Automatic Transmissions - 6L45/6L50/6L80/6L90
«Manual Transmission Schematics»(ref-620502-S00887853342014060500000) for the Manual Transmission Tremec 6-speed

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Automatic Transmission

Ignition ON.
Verify that no ignition, KR27 Starter Relay, brake pedal position sensor, immobilizer, or 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/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) If no DTCs are set
Verify the scan tool 5 V Ignition Switch parameter is Crank Request while attempting to start the vehicle. If parameter does not display Crank Request Refer to «Vehicle Will Not Change Power Mode»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures) If parameter displays Crank Request
Verify the scan tool TCM Internal Mode Switch parameter displays Park when in park. If the TCM Internal Mode Switch parameter does not indicate Park . Refer to «Transmission Internal Mode Switch Logic»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-specifications__transmission-internal-mode-switch-logic) If the TCM Internal Mode Switch parameter displays Park
Verify the scan tool ECM Crankshaft Position Active Counter parameter is not incrementing. If the counter increments Replace the B26 Crankshaft Position Sensor. If the counter does not increment
Verify the engine cranks in park or neutral. If the KR27 Starter Relay does not click or the engine does not crank Refer to Circuit/System Testing. If the engine cranks
All OK

Manual Transmission

Ignition ON.
Verify that no ignition, KR27 Starter Relay, clutch pedal position sensor, brake pedal position sensor, or immobilizer 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/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) If no DTCs are set
Verify the scan tool 5 V Ignition Switch parameter is Crank Request while attempting to start the vehicle. If parameter does not display Crank Request Refer to «Power Mode Mismatch»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
Ignition ON.
Verify the scan tool Clutch Pedal Starter Inhibit Switch parameter changes between On and Off while depressing and releasing the clutch pedal. If the Clutch Pedal Starter Inhibit parameter does not change Refer to «Clutch Pedal Position Sensor Learn»(ref-620502-S35024765862014060500000) If the clutch pedal starter inhibit parameter does change
Fully depress clutch pedal.
Attempt to start the vehicle.
Verify the scan tool ECM Crankshaft Position Active Counter parameter is not incrementing. If the counter increments Replace the B26 Crankshaft Position Sensor. If the counter does not increment
Verify the crank relay does click and the engine begins cranking. If the KR27 Starter Relay does not click or the engine does not begin cranking Refer to Circuit/System Testing. If the KR27 Starter Relay does click and the engine does begin cranking
All OK

Ignition ON.
Verify the scan tool ECM Ignition 1 Signal parameter is greater than 10 V. If 10 V or less Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the ignition voltage circuits and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 10 V
Ignition OFF, disconnect the KR27 Starter Relay, ignition ON.
Verify that a test lamp illuminates between the B+ circuit terminal 30 and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition OFF. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF. Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, Disconnect X1 harness connector at the M64 Starter Motor. Test for infinite resistance between the control circuit terminal 87 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the M64 Starter Motor. If the test lamp illuminates
Ensure the parking brake is applied and the automatic transmission is in PARK or the manual transmission is in neutral. Momentarily install a 30 A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87.
Verify the M64 Starter Motor is activated. If the M64 Starter Motor does not activate Disconnect the X1 harness connector at the M64 Starter Motor. Test for less than 2 ohms in the control circuit end to end. If greater the 2 ohms, repair the open/high resistance in the circuit. If less than 2 ohms, replace the M64 Starter Motor. If the M64 Starter Motor activates
Test or replace the KR27 Starter Relay.

Relay Test

Ignition OFF.
Disconnect the KR27 Starter Relay.
Test for 60-180 ohms between terminals 85 and 86. If not within 60-180 ohms Replace the relay. If within 60-180 ohms
Test for infinite resistance between the following terminals: 30 and 86 30 and 87 30 and 85 85 and 87 If not infinite resistance Replace the relay. If infinite resistance
Install a 20 A fused jumper wire between relay terminal 85 and B+.
Install a jumper wire between relay terminal 86 and ground.
Test for less than 2 ohms between terminals 30 and 87. If 2 ohms or greater Replace the relay If less than 2 ohms
All OK

Perform the Diagnostic Repair Verification after completing the repair.

«Manual Shift Shaft Position Switch Replacement»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-repair-instructions-on-vehicle)
«Relay Replacement (Within an Electrical Center)»(/cadillac/ats/i-2012-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions__relay-replacement-within-an-electrical-center) , «Relay Replacement (Attached to Wire Harness)»(/cadillac/ats/i-2012-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
«Starter Replacement (LFX)»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system) , «Starter Replacement (LCV,LTG)»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system)
«Crankshaft Position Sensor Replacement»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions) for the 2.0L engine
«Crankshaft Position Sensor Replacement»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-36l-lfx-repair-instructions) for the 3.6L engine
«Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, programming, and setup

Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/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/ats/i-2012-2014/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/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/ats/i-2012-2014/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 C1 Battery terminals.
Verify the measured voltage is between 12-15 V. If voltage is less than 12 V or greater than 15 V Refer to «Battery Inspection/Test»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system) . If voltage is between 12-15 V
Remove the drive belts. Refer to «Drive Belt Replacement»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-repair-instructions-on-vehicle) , for the 2.0 L LTG or 2.5 L LCV engines or «Drive Belt Replacement»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-36l-lfx-repair-instructions-on-vehicle) for the 3.6 L LFX engine.
Verify the crankshaft rotates. Rotate the crankshaft by hand using the appropriate tools. If the crankshaft does not rotate Refer to «Engine Will Not Crank - Crankshaft Will Not Rotate»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-diagnostic-information-and-procedures__engine-will-not-crank-crankshaft) . If the crankshaft rotates
Verify the engine does not crank when attempting to start the vehicle. If the engine cranks Inspect the engine and belt drive system for mechanical binding, seized engine, or seized generator. If the engine does not crank
Verify that a test lamp illuminates between the M64 Starter Motor B+ terminal A X2 and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition OFF. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF. Test for greater than 100 ohms between the B+ circuit and ground. If 100 ohms or less, repair the short to ground on the circuit. If greater than 100 ohms, replace the M64 Starter Motor. If the test lamp illuminates
Test for less than 0.5 V between the positive battery post and M64 Starter Motor B+ terminal A X2 with the ignition in the CRANK position. If 0.5 V or greater Replace the positive battery cable. If less than 0.5 V
Test for less than 0.5 V between the negative battery post and the M64 Starter Motor case with the ignition in the CRANK position. If 0.5 V or greater Replace the negative battery cable. less than 0.5 V
Replace the M64 Starter Motor.

Perform the Diagnostic Repair Verification after completing the repair.

«Battery Negative Cable Replacement»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system)
«Battery Positive Cable Replacement»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system)
«Starter Replacement (LFX)»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system) , «Starter Replacement (LCV,LTG)»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system)

Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/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/ats/i-2012-2014/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