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Body Control System Diagnostic System Check

NOTE: Diagnostic Trouble Codes (DTC) 41-45 will only set while in Body Control Module (BCM) diagnostic mode and a button on Remote Keyless Entry (RKE) transmitter is pressed. DTCs 42-45 are used to determine performance of RKE transmitter and receiver in BCM.
  1. Turn ignition switch to RUN position to deactivate Content Theft Deterrent (CTD) alarm system (if equipped). Turn ignition switch to OFF position. Remove RADIO fuse No. 17 (15-amp) from instrument panel fuse block. RADIO fuse is located in lower right-hand corner of fuse block.
  2. Turn ignition switch to ACC position. Chime will sound 1-2 times to verify system has entered programming mode for customizing special features. Within 5 seconds, turn ignition switch to OFF position, then immediately back to ACC position. Chime will sound 3 times to verify diagnostic mode has now been entered.
  3. BCM will start to flash DTCs on SECURITY indicator 4 seconds after entering diagnostic mode. Each flash of indicator represents a number. For example, one flash followed by 2 quick flashes represents DTC 12. DTC 12 will always be the first DTC displayed, indicating diagnostic mode is at beginning of DTC display. Last DTC to be displayed will be DTC 55 followed by hardware configuration, then software configuration. Each DTC is displayed 3 times before next DTC is displayed.
  4. If more than one DTC is present, DTCs will display beginning with lowest current DTC to highest current DTC, followed by lowest history DTC to highest history DTC. RKE transmitter DTCs 41-45 will then be displayed if invoked while in diagnostic mode. DTCs will cycle sequentially until diagnostic mode is exited. To exit diagnostic mode, turn ignition switch to OFF position, and install RADIO fuse.
BCM DTC DEFINITIONS

DTC Description
12  Diagnostic System Check
21/31  Courtesy Lights Feed Circuit Shorted To Ground
22/32  Courtesy Lights Return Circuit Shorted To Battery
23/33  Retained Accessory Power (RAP) Circuit Shorted To Ground Or Battery
24/34  Seat Belt Indicator Circuit Shorted To Ground Or Battery
25/35 (1) Security Indicator Status
41 (2) Last Message Received Valid
42 (2) Last Message Received Invalid
43 (2) Last Message Received With Sumcheck Error
44 (2) Last Message Received With Encryption Error
45 (2) Receiver Processing In 20-Second Lock-Out
55  Begin Configuration Display
(1) On vehicles equipped with Content Theft Deterrent (CTD) system.
(2) On vehicles equipped with Remote Keyless Entry (RKE) system. DTCs are automatically cleared after they are displayed. To display DTCs again, an RKE transmitter button must be pushed again.
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