WARNING: Vehicles are equipped with Supplemental Inflatable Restraint (SIR) system. Before attempting ANY repairs involving steering column, instrument panel or related components, see SERVICE PRECAUTIONS and DISABLING & ACTIVATING AIR BAG SYSTEM in appropriate AIR BAG RESTRAINT SYSTEMS article in ACCESSORIES & EQUIPMENT.

Disconnect ignition switch connectors. Check for continuity between specified terminals at appropriate ignition switch positions. On "L" series, see IGNITION SWITCH CONTINUITY ("L" SERIES) table. See Fig 1 and Fig 2 . On "S" series, see IGNITION SWITCH CONTINUITY ("S" SERIES) table. See Fig 3 . On all models, if continuity does not exist between specified terminals, replace ignition switch.

IGNITION SWITCH CONTINUITY ("L" SERIES)

Ignition Switch Position	Continuity Between Connector/Terminal
Key In Ignition Switch	Black "F" & Natural "F"
ACCESSORY	Black "A" & "B", Black "C" & Natural "D"
RUN	Black "A" & "B", Black "B" & Natural "A", Black "C" & Natural "D", Black "C" & Natural "B", Black "A" & Natural "A", Natural "B" & "D"
START	Black "A" & Natural "A", Black "C" & Natural "D", Black "C" & Natural "C", Black "D" & Natural "E", Natural "C" & "D"

Fig 1: Identifying Ignition Switch Black Connector Terminals ("L" Series)

Courtesy of GENERAL MOTORS CORP.

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.

Safety Warning

Ignition Switch Test

Use the Manual With the Right Hardware

When to See a Mechanic

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