2010 Cadillac Truck Escalade ESV AWD V8-6.2L Page 1607
* negative contactor terminal X2
* negative contactor terminal X3
锟斤拷If less than the specified value, replace the high voltage cable.
3. Test for less than 1 ohm between the terminals listed below;
* B+ (300 V) and positive contactor terminal X2
* Ground (300 V) and negative contactor terminal X2
* positive contactor terminal X3 and positive cable terminal X1
* negative contactor terminal X3 and negative cable terminal X2
锟斤拷If greater than the specified range, replace the high voltage cable.
4. Connect the 12 V battery.
5. Ignition ON, command the negative and positive contactors and the current limit relay ON and OFF with a scan tool. Listen for the contactors
and relay to turn ON and OFF.
锟斤拷If the negative contactor, positive contactor or the current limit relay does not turn ON and OFF, refer to High Voltage Contactor/Relay
Malfunction ().
6. If all the circuit tests normal, replace the drive motor generator battery.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Drive Motor Battery Negative Relay Cable Replacement ()
* Drive Motor Battery Positive Relay Cable Replacement ()
* Drive Motor Battery Positive and Negative Cable Replacement ()
* Drive Motor Generator Battery Replacement and Shipping Preparation ()
* Control Module References (See: Testing and Inspection/Programming and Relearning) for drive motor generator battery control module
replacement, setup and programming
P1AE8
DTC P1AE8, P1AE9, P1AEA, or P1AEB
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC P1AE8
- Drive Motor 1 Control Module Hybrid Battery Voltage Sense Circuit Low Voltage
DTC P1AE9
- Drive Motor 1 Control Module Hybrid Battery Voltage Sense Circuit High Voltage
DTC P1AEA
- Drive Motor 2 Control Module Hybrid Battery Voltage Sense Circuit Low Voltage
DTC P1AEB
- Drive Motor 2 Control Module Hybrid Battery Voltage Sense Circuit High Voltage
Circuit/System Description
The drive motor generator power inverter module (PIM) contains two motor control modules (MCM). Each MCM monitors its internal high
voltage sensor for correct operation.
Conditions for Running the DTC
* Ignition is ON.
* Ignition voltage is 8-18V.
