G 20 Van V8-379 6.2L DSL VIN C FI (1992)
3. This checks for grounded CKT 487 from terminal "C", of lamp driver, to ECM terminal "A1O", an open CKT 439 to terminal "B" of lamp
driver, a bad ground, or faulty lamp driver. A normal reading is about 9 to 11 volts, because of the drop through the upper resistor in the lamp
driver. Over 11 volts indicates there is no drop in the lamp driver. This indicates a bad ground or faulty lamp driver.
4. This step checks for an open in the wire to terminal "B". Normal voltage is approximately battery voltage.
5. This checks for a grounded CKT 487 from driver terminal "C" to ECM terminal "A1O". Normal response is light "ON."
