Diagnostic Strategies

CHECK AND RESET SOFT STOPS
To check and reset the power memory seat soft stops, use the power seat control switches to move the seat in one direction to the end of travel, allow a couple of seconds before re-energizing the seat in the same direction until it stops and for three additional seconds after it stops. (The amount the seat moved upon the second energizing is the amount the soft stops have been reprogrammed.

Repeat this procedure for each direction of seat movement (One at a time).

NOTE: Checking and resetting of the power memory seat soft stops will not affect the customer's programmed positions.

MEMORY SYSTEM
In order to obtain conclusive testing of the memory system, the Programmable Communications Interface (PCI) data bus network and all of the electronic modules that provide inputs to, or receive outputs from the memory system components must be checked.

The most reliable, efficient, and accurate means to diagnose the memory system requires the use of a DRB III scan tool and the proper Diagnostic Procedures. The DRB III scan tool can provide confirmation that the PCI data bus is functional, that all of the electronic modules are sending and receiving the proper messages on the PCI data bus, and that the memory system is receiving the proper hard wired inputs and relaying the proper hard wired outputs to perform its functions.

Following are diagnostic routines that are built into the module which can be performed without the use of a diagnostic scan tool. Refer to Wiring Diagrams for complete circuit schematic or connector pin-out information.

Diagnostic Mode 1
Diagnostic Mode 1 clears soft limits and sets memory selector switches (1 and 2) to predetermined values.

ACTIVATION- Press and hold the S and 1 buttons for 5 seconds to enter diagnostic mode 1. This mode is exited at the completion of the mode 1 tasks or upon grounding the DATA G87 circuit input to the module.

Mode 1 will:
- Clear all soft limits to their default hard limit values
- Load memory 1 with default settings corresponding to horizontal rearward, front down, rear down, and recliner rearward positions
- Load memory 2 with default settings corresponding to horizontal forward, front up, rear up, and recliner forward positions

Diagnostic Mode 2
Diagnostic mode 2 provides a way to determine if the seat/mirror motors and position sensors are connected properly.

ACTIVATION- Press and hold the S and 2 buttons for 5 seconds to enter diagnostic mode 2.This mode is exited after 5 seconds of switch inactivity or upon grounding the DATA G87 circuit input by moving the transmission out of the PARK position.

Mode 2 will:
- Place the seat and mirror motors at their midpoint
- When a single axis of seat or mirror motion is requested by pressing a switch, the corresponding motor is energized. This tests switch input and motor output