2000 Saturn LS1 L4-2.2L VIN FFACTORY OEM SERVICE PROCEDURE

Lighting

Circuit Chart:

Factory service manual diagram



CIRCUIT CHART
Circuit assignments for the body control module (BCM) relating to lighting:

DISPLAY DIMMING
Display dimming is controlled by the BCM based on input received from the dimming potentiometer. The dimming potentiometer is connected between circuit 1359 and circuit 1381. The BCM monitors these inputs and provides a Pulse Width Modulated (PWM) output at circuit eight to operate the display lamps.

PARK LAMP SWITCH
The BCM compares the state of the park lamp circuit nine to the high beam headlamp circuit 1200 and the low beam headlamp circuit 1201.

If the park lamp circuit is grounded/open and either the low beam circuit is at battery voltage or the high beam circuit is grounded, DTC B2662 - Parklamp Switch Circuit Malfunction will set.







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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
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  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
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