Circuit Description
The instrument panel module (IPM) is the power mode master and the remote control door lock receiver (RCDLR) is the backup power mode master. The both modules receive the same information from ignition mode switch therefore are able to correctly discern all power modes. There is no degradation in vehicle operation when the backup power mode is active.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B1422 Device Power Moding Error
DTC Symptom | DTC Symptom Descriptor |
|---|---|
52 | Device Power Moding Compare Failure |
Conditions for Running the DTC
Voltage supplied to the module is in the normal operating voltage range of 9-16 volts.
Conditions for Setting the DTC
The following conditions enable the backup power mode:
| • | The RCDLR detects a loss of the power mode message from the IPM. |
| • | The IPM invalidates the power mode message. |
| • | The RCDLR senses a change on its ignition mode switch inputs, twice, without receiving the corresponding message from the IPM. |
Action Taken When the DTC Sets
The backup power mode becomes the system power mode. This code will set following the setting of the DTC B1440.
The Service Vehicle Soon (SVS) indicator will illuminate.
Conditions for Clearing the DTC
| • | A current DTC clears when the malfunction is no longer present. |
| • | A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction. |
Diagnostic Aids
The setting of this DTC can be caused by various failures:
| • | The ignition mode switch malfunction |
| • | The ignition mode data input circuits to IPM |
| • | The IPM malfunction |
Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Values | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Power Distribution Schematics Connector End View Reference: Master Electrical Component List | ||||||||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |||||||
Did you retrieve any of the following DTCs?
| -- | Go to Step 3 | ||||||||
3 |
Did you find and correct the condition? | -- | Go to Step 5 | Go to Step 4 | ||||||
4 | Replace the IPM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 5 | -- | ||||||
5 |
Does the DTC reset? | -- | Go to Step 1 | System OK | ||||||
