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.
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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 30 (HVAC SYSTEMS - AUTOMATIC)DIAGNOSTIC TESTSDTC B2805: STEERING WHEEL CONTROLS
1999 GMC Forward Control 5.7 R, Automatic
DTC B2805: Steering Wheel Controls
1999 GMC Forward Control 5.7 R, AutomaticSECTION DTC B2805: Steering Wheel Controls
WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
The number below refers to the step number of the diagnostic table.
- 2 - This step verifies that one of the temperature switches of the steering wheel controls is active. The value given is the normal condition that exists when no switch is activated.
- Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM. After performing system check, go to next step.
- Connect scan tool. Turn ignition on. Using scan tool, observe STEERING WHEEL CONTROLS parameter in DASH INTEGRATION MODULE data list. If scan tool indicates 0-7 counts, ensure counts match switch position. See STEERING WHEEL CONTROL COUNTS table. Also check wiring and connectors for intermittent loose wires and/or poor connections and go to step 3. If scan tool indicates anything other than 0-7 counts, replace steering wheel controls. See STEERING WHEEL CONTROL SWITCHES under REMOVAL & INSTALLATION. Go to next step.STEERING WHEEL CONTROL COUNTS
Switch Position Counts No Input 0 TEMP DOWN 136 TEMP UP 162 - Use scan tool to clear DTCs. Operate vehicle and verify that DTCs do not reset. If DTCs reset, return to step 2. If DTCs do not reset, system is okay.
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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.