LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Cadillac >> 1997 >> Seville STS >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Body Control Module >> Diagnosis & Repair >> DTC B1970, Exterior Light Power Fault >> Testing
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC B1970, Exterior Light Power Fault: Testing

  1. Turn ignition switch to OFF position. Remove parking light relay and headlight relay. Disconnect PZM connectors. Using DVOM, check resistance between parking light relay connector terminal A6 (White wire) and ground. If resistance is 5 ohms or less, go to next step. If resistance is greater than 5 ohms, replace PZM.
  2. Repair short to ground in White wire between parking light relay and PZM. Reconnect all components. Turn ignition switch to ON position. Turn headlights on. If headlights do not come on, replace PZM. If headlights come on, system is functioning normally.
scientia non olet · About LEMON Manuals