Password Learn Procedure For Anti-Theft System (Cutlass & Malibu)

Password learn procedure must be performed if Body Function Controller (BFC) is replaced. A password is communicated between BFC and Powertrain Control Module (PCM) to provide engine operation. If BFC is replaced, the PCM must learn the password from the BFC. If password learn procedure is not performed, Diagnostic Trouble Codes (DTCs) P1631 and P1632 may be set in the PCM when attempting to start the engine.
NOTE: If PCM is replaced, the Electronically Erasable Programmable Read Only Memory (EEPROM) should be programmed. When EEPROM is programmed, the PCM will learn the password when ignition is initially turned on. Password learn procedure is not required when replacing the PCM and EEPROM is programmed.
Attempt to start engine and then leave ignition on. DO NOT turn ignition off. The THEFT SYSTEM indicator light will flash for about 10 minutes and then turn off. THEFT SYSTEM indicator light is located on instrument panel, just to the left of tachometer.
Once THEFT SYSTEM indicator light stops flashing, turn ignition off. Attempt to start the engine. If engine starts, the password learn procedure is complete.
On Malibu 2.4L, if password is not learned, a Diagnostic Trouble Code (DTC) P1626, P1632 and U1064 may be set in PCM. Perform test procedures for specified DTC and repair as necessary. See the appropriate TESTS W/CODES article in ENGINE PERFORMANCE.
On Cutlass 3.1L and Malibu 3.1L, if password is not learned, a Diagnostic Trouble Code (DTC) P1610, P1626 and P1632 may be set in PCM. Perform test procedures for specified DTC and repair as necessary. See the appropriate TESTS W/CODES article in ENGINE PERFORMANCE.