Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Diagnosis And Testing
The left multi-function 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. The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds.
However, conventional diagnostic methods will not prove conclusive in the diagnosis of the Steering Control Module (SCM) or the electronic controls or communication between other modules and devices that provide some features of the interior and exterior lighting 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 left multi-function switch from the Steering Control Module (SCM). See REMOVAL .
- Using an ohmmeter, test the resistance between the terminals of the switch as shown in the three Function Tests tables.
CONTROL STALK FUNCTION TESTS FUNCTION CAVITIES RESISTANCE 1 2 3 Neutral X X X Open Circuit Right Turn - X X 0 Ohms Left Turn - X X 649 Ohms Beam Select X X - 649 Ohms Flash-To-Pass X X - 0 Ohms CONTROL KNOB FUNCTION TESTS FUNCTION CAVITIES RESISTANCE 4 5 6 7 Off X - X 869 Ohms Park Lamps - - X X 221 Ohms Headlamps X - X 221 Ohms Auto Headlamps - - X X 869 Ohms Front Fog Lamps - X X 0 Ohms Rear Fog Lamps X X 869 Ohms CONTROL SLEEVE FUNCTION TESTS FUNCTION CAVITIES RESISTANCE 8 9 10 11 Dome Defeat - - X X 49.9 Ohms X - X 1100 Ohms Dimming Level 1 - - X X 118 Ohms X X 1100 Ohms Dimming Level 2 - - X X 225 Ohms X - X 1100 Ohms Dimming Level 3 - - X X 451 Ohms X X 1100 Ohms Dimming Level 4 - - X X 1100 Ohms X - X 1100 Ohms Dimming Level 5 - - X X 1100 Ohms - X X 451 Ohms Dimming Level 6 - - X X 1100 Ohms - X X 225 Ohms Parade Mode - - X X 1100 Ohms - X X 118 Ohms Dome On - - X X 1100 Ohms - X X 49.9 Ohms - If the switch fails any of the tests, replace the ineffective left multi-function switch as required.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.