Normal Operation

WARNING: This page is about a different car, the 2008 Mercury Mariner and 2008 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

When the stability/traction assist switch is pressed, a ground circuit is momentarily completed. The ABS module detects this ground and disables the roll stability control system and the traction assist system. The system is enabled when the switch is pressed a second time.

Circuit CCA15 (YE/GY) connects the ABS module to the stability/traction control switch. The stability/traction control switch is grounded along circuit GD114 (BK/BU). When the switch is pressed, the 2 circuits are momentarily connected and the ABS module receives a ground signal. The ABS module sends a message to the instrument cluster and the PCM along the high speed communication area network (HS-CAN) bus to illuminate the traction control/roll stability control indicator and to regulate fuel and spark to the cylinders.

This pinpoint test is intended to diagnose the following:

Wiring, terminals or connectors
Stability/traction control switch
ABS module