Diagnostic Procedures

WARNING: This page is about a different car, the 2003 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: DTC P1634: Improper Ignition 1 Input (Steps 1-6)

Courtesy of GENERAL MOTORS CORP.

Fig 2: DTC P1634: Improper Ignition 1 Input (Steps 7-15)

Courtesy of GENERAL MOTORS CORP.

Fig 3: DTC P1634: Improper Ignition 1 Input (Steps 16-22)

Courtesy of GENERAL MOTORS CORP.