B147E
DTC B147E
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
Diagnostic Fault Information
Circuit/System Description
The battery saver 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, such as disabling the Remote Function Actuator or content theft features.
The battery saver mode incorporates a latching relay that when enabled disconnects some modules from their ignition power or memory power sources. Battery saver mode is initiated by turning on the hazard flashers, starting the vehicle, and then turning the ignition key into the crank position or pushing the push button start switch (if equipped) for greater than 15 seconds. The mode is disengaged by repeating the previous process causing the relay to latch in the other direction. 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 circuit.
Action Taken When the DTC Sets
The module output driver will be shut down and not supply voltage to the battery saver relay set circuit.
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 Sunshade - Left (D61)
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 KR104A Battery Saver Relay 1 turns ON and OFF when enabling and disabling the battery saver mode.
• If the KR104A Battery Saver Relay 1 does not turn ON and OFF
Refer to Circuit/System Testing.
• If the KR104A Battery Saver Relay 1 turns ON and OFF
3. All OK.
Circuit/System Testing
1. Ignition OFF, disconnect the KR104A Battery Saver Relay 1, ignition ON.
2. Connect a test lamp between the control circuit terminal 1 and ground.
3. 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, 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, 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
4. Test or replace the KR104A Battery Saver Relay 1.
Component Testing
Relay Test
1. Ignition OFF, disconnect the KR104A Battery Saver Relay 1.
2. Test for 70-150 omhs between terminals 6 and 1.
• 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
* 1 and 5
• If less than infinite resistance
Replace the relay.
• If infinite resistance
5. 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
6. Install a 3 A fused jumper wire between relay terminal 2 and 12 V. Install a jumper wire between relay terminal 6 and ground.
7. 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
8. All OK
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Relay Replacement (Within an Electrical Center) Relay Replacement (Within an Electrical Center)Relay Replacement (Attached to Wire Harness) Relay Replacement (Attached to Wire Harness)
* Control Module References Control Module References for Body Control Module replacement, programming and setup