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B147E




DTC B147E or B147F

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC B147E 01
- Battery Saver Relay Set Secondary Circuit Short to Battery

DTC B147E 02
- Battery Saver Relay Set Secondary Circuit Short to Ground

DTC B147E 04
- Battery Saver Relay Set Secondary Circuit Open

DTC B147F 01
- Battery Saver Relay Reset Secondary Circuit Short to Battery

DTC B147F 02
- Battery Saver Relay Reset Secondary Circuit Short to Ground

DTC B147F 04
- Battery Saver Relay Reset Secondary Circuit Open

Diagnostic Fault Information






Circuit/System Description

The battery saver mode (transport mode) reduces the parasitic load of some modules during overseas shipment or during vehicle storage conditions. This improves the drain time on the battery (up to 70 days without the battery going dead). When the vehicle is in transport/storage, some features may have reduced functionality while in the battery saver mode (transport mode), such as disabling the Remote Function Actuator or content theft features.

The battery saver mode (transport mode) incorporates a latching relay that when enabled disconnects some modules from their ignition power or memory power sources. Battery saver mode (transport mode) is initiated by turning on the hazard flashers and then turning the ignition key into the crank position or pushing the push button start switch (if equipped) for greater than 15 seconds. After battery saver mode (transport mode) has been enabled, the BCM may not send the command to unlatch the relay until after the ignition has been switched to the off position for up to 1 minute. In battery saver mode (transport mode) the BCM will send a command to latch the relay for operation of those modules while the ignition is in the run position and then again unlatching the relay after the ignition is turned off. The mode is disengaged by repeating the previous process causing the relay to latch in the other direction. The DIC (if equipped) will display Transport Mode is On when the transport mode is enabled and Transport Mode is Off when the transport mode is disabled. For vehicles not equipped with a DIC, the battery indicator light will constantly flash on the Instrument Cluster when transport mode is enabled. Once the vehicle is running and the hazard flashers are on, turning the ignition key into the crank position or pushing the push button start switch (if equipped) for greater than 15 seconds will latch the relay in the other direction. This feature can be used as many times as necessary if the vehicle is to be stored for an extended period of time.

Conditions for Running the DTC

* The system voltage is between 9-16 V.

* The DTC can only run when the output is activated.

Conditions for Setting the DTC

The BCM detects a short to ground in the battery saver relay set/reset circuits.

Action Taken When the DTC Sets

The module output driver will be shut down and not supply voltage to the battery saver relay set/reset circuits.

Conditions for Clearing the DTC

* The current DTC will clear when the module request for the output is removed or the malfunction is no longer present.

* A history DTC clears when the module ignition cycle counter reaches the reset threshold of 50, without a repeat of the malfunction.

Reference Information

Schematic Reference

* Body Control System Schematics [1][2]Body Control Systems

* Power Distribution Schematics Power Distribution Schematics

Connector End View Reference

Component Connector End Views Fuel Pump and Level Sensor Assembly

Description and Operation

Power Mode Description and Operation Power Mode

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

1. Ignition ON.

2. Verify the KR104B Battery Saver Relay 2 turns ON and OFF when enabling and disabling the battery saver mode.

• If the KR104B Battery Saver Relay 2 does not turn ON and OFF
Refer to Circuit/System Testing.

• If the KR104B Battery Saver Relay 2 turns ON and OFF

3. All OK.

Circuit/System Testing

1. Ignition OFF and all vehicle systems OFF, disconnect the KR104B Battery Saver Relay 2. It may take up to 2 minutes for all vehicle systems to power down.

2. Test for less than 10 ohms between the ground circuit terminal 6 and ground.

• If 10 ohms or greater

1. Ignition OFF.

2. 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

3. Ignition ON.

4. Verify a test lamp illuminates between the B+ circuit terminal 5 and ground.

• If the test lamp does not illuminate
Replace the X51A Fuse Block - Instrument Panel.

• If the test lamp illuminates

5. Connect a test lamp between the control circuit terminal 1 and ground.

6. Verify the test lamp turns ON and OFF when enabling and disabling the battery saver mode.

• If the test lamp is always OFF

1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module.

2. 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

3. 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 is always ON

1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module, ignition ON.

2. 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 K9 Body Control Module.

• If the test lamp turns ON and OFF

7. Connect a test lamp between the control circuit terminal 2 and ground.

8. Verify the test lamp turns ON and OFF when enabling and disabling the battery saver mode.

• If the test lamp is always OFF

1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module.

2. 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

3. 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 is always ON

1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module, ignition ON.

2. 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 K9 Body Control Module.

• If the test lamp turns ON and OFF

9. Verify that a test lamp does not illuminate between the ignition circuit terminal 3 and ground.

• If the test lamp illuminates
Repair the short to voltage on the ignition circuit

• If the test lamp does not illuminate

10. Ignition ON, connect a 40 A fused jumper wire between the B+ circuit terminal 5 and the ignition circuit terminal 3.

11. Verify device is activated.

• If the device does not activate

1. Ignition OFF, disconnect the harness connector at the device.

2. 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

3. 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, replace the device.

• If the device activates

12. Test or replace the KR104B Battery Saver Relay 2.

Component Testing

Relay Test

1. Ignition OFF, disconnect the KR104B Battery Saver Relay 2.

2. Test for 70-150 ohms between terminals the following terminals.

* 1 and 6

* 2 and 6

• If less than 70 or greater than 150 ohms
Replace the relay.

• If between 70-150 ohms

3. Install a 3 A fused jumper wire between relay terminal 1 and 12 V. Install a jumper wire between relay terminal 6 and ground.

4. Test for infinite resistance between the following terminals:

* 3 and 6

* 3 and 5

* 3 and 1

* 3 and 2

* 1 and 5

* 2 and 5

• If less than infinite resistance
Replace the relay.

• If infinite resistance

5. Install a 3 A fused jumper wire between relay terminal 1 and 12 V. Install a jumper wire between relay terminal 6 and ground.

6. Test for less than 5.0 ohms between terminals 3 and 5.

• If 5.0 ohms or greater
Replace the relay.

• If less than 5.0 ohms

7. All OK

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

* Relay Replacement (Attached to Wire Harness) Relay Replacement (Attached to Wire Harness)Relay Replacement (Within an Electrical Center) Relay Replacement (Within an Electrical Center)

* Control Module References Control Module References for Body Control Module replacement, programming and setup

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