Service Wrench Tell Tale - Electronic Power Steering (EPS)

SERVICE WRENCH TELLTALE
When ignition is switched On, the EPS control module performs a self-diagnostic routine while the I/P cluster performs a bulb check by illuminating the Service Wrench telltale for approximately three seconds.
Once the EPS control module determines the state of the EPS, it transmits a serial data message to the I/P cluster to command the Service Wrench telltale On or Off, depending on the state of the EPS. in the event of a Class II serial data loss, the Service Wrench telltale will be On.