Diagnosis And Testing - Right MULTIFUNCTION Switch
To avoid serious or fatal injury on vehicles equipped with airbags, disable the Supplemental Restraint System (SRS) before attempting any steering wheel, steering column, airbag, seat belt tensioner, impact sensor or instrument panel component diagnosis or service. Disconnect and isolate the battery negative (ground) cable, then wait two minutes for the system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the SRS. Failure to take the proper precautions could result in accidental airbag deployment.
The right multifunction switch as well as the hard wired inputs and outputs of the switch may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information.
However, conventional diagnostic methods will not prove conclusive in the diagnosis of the Steering Control Module (SCM) or the electronic controls and communication between other modules and devices that provide some features of the front and rear wiper and washer systems. The most reliable, efficient and accurate means to diagnose the SCM or the electronic controls and communication related to SCM operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.
- Remove the right multifunction switch from the integral mounting bracket on the right side of the clockspring. Refer to SWITCH, MULTIFUNCTION, RIGHT, REMOVAL .
- Using an ohmmeter, test the resistance between the terminals of the switch as shown in the three Function Tests charts
. For all functions except those of the control stalk the values should be either less than 100 ohms (switch CLOSED) or greater than 1 megohm (switch OPEN).
CONTROL STALK FUNCTION TESTS FUNCTION PINS RESISTANCE 1 7 Front Wash X X 10000 Ohms Front Mist X X 5490 Ohms CONTROL KNOB FUNCTION TESTS FUNCTION BETWEEN PIN 7 (GROUND) AND PINS 4 5 6 Off CLOSED CLOSED OPEN Front Delay 1 CLOSED CLOSED CLOSED Front Delay 2 CLOSED OPEN CLOSED Front Delay 3 OPEN OPEN CLOSED Front Delay 4 OPEN CLOSED CLOSED Front Delay 5 OPEN CLOSED OPEN Front Wiper Low OPEN OPEN OPEN Front Wiper High CLOSED OPEN OPEN CONTROL SLEEVE FUNCTION TESTS FUNCTION BETWEEN PIN 7 (GROUND) AND PINS 2 3 Off CLOSED OPEN Rear Wipe CLOSED CLOSED Rear Wash OPEN CLOSED - If the switch fails any of the tests, replace the ineffective right multifunction switch as required. If the switch tests okay, but the switch input to the Steering Control Module (SCM) remains incorrect, be certain to check for a short or open in the jumper harness between the right multifunction switch and the SCM.