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Home >> Oldsmobile >> 1990 >> Toronado Base, 4T60/ME9 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - BCM >> BCM Trouble Code Charts >> Code B420 (B), Twilight Relay Circuits >> Note On Intermittents

Note On Intermittents

If an intermittent Code B420 is being set. Manipulate related wiring in output function and watch for relays to cycle.

Fig 1: Code B420 (B): Circuit Diagram
G90A17293
Fig 2: Code B420 (B): Flow Chart Twilight Relay Circuit
G90B14390
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