Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC P2536: Ignition Accessory Switch CircuitCircuit/System Description
The transmission control module (TCM) will wakeup from sleep mode when a voltage greater than 5 V is detected on the switched ignition input or accessory/wakeup input. The Body Control Module (BCM) provides voltage to the TCM accessory/wakeup input. After wakeup, the TCM will not go into sleep mode until the accessory/wakeup input and ignition input are less than 5 V.
Conditions for Running the DTC
| • | Battery voltage is greater than 9 V and less than 18 V. |
| • | Ignition voltage is greater than 5 V. |
| • | Engine speed is greater than 200 RPM for 5 seconds. |
Conditions for Setting the DTC
This DTC sets when the accessory/wakeup is not active for 60 seconds.
Action Taken When the DTC Sets
| • | The TCM does not request the ECM to illuminate the malfunction indicator lamp (MIL). |
| • | DTC P2536 is stored in TCM history. |
Conditions for Clearing the DTC
DTC P2536 is a Type C DTC.
Diagnostic Aids
You may have to drive the vehicle in order to experience a condition.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics
Connector End View Reference
Description and Operation
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Ignition ACCESSORY, verify that a scan tool can communicate with the TCM.
- Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the TCM.
- Ignition ACCESSORY, test for greater than 5 V on the signal circuit between the TCM harness connector terminal 43 and ground.
- If the signal circuit tests normal, replace the TCM.
| ⇒ | If less than the specified value, test signal circuit for a short to ground, or an open/high resistance. If the circuit tests normal, replace the BCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for TCM replacement, setup, and programming |
Repair Verification
If another DTC is present, refer to Diagnostic Trouble Code (DTC) List - Vehicle and perform the appropriate diagnostic procedure.
