Both Transmitters Operate Some But Not All Remote Keyless Entry features
WARNING: This page is about a different car, the 1991 Pontiac Bonneville. However, it is still accessible from the selected car via links, so may be relevant.
Go To TEST A, and check all terminals under KEYLESS ENTRY MODULE CONNECTOR C1 (BLACK) - DISCONNECTED PIN OUT TEST table and all terminals under KEYLESS ENTRY MODULE CONNECTOR C2 (BLUE) - DISCONNECTED PIN OUT TEST table.