GM Service Manual Online
For 1990-2009 cars only

Body Control Module (BCM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON, Engine OFF

Arming Status

BCM Data

Active/Inactive

Inactive

Content Theft Mode

BCM Data

Ignition On/Arm Pending/Standby/Sim. Arm. Pend./Trunk Open/Unlocked/Open/Locked/Ignition Lock/Sim. Armed/Armed/Warn Away/Alarm/Audible Only

Ignition On

CTD Status

BCM Data

Armed/Disarmed

Disarmed

Door Ajar Switch

BCM Data

Door Closed/Door Ajar

Door Closed

Door Cylinder Switch

BCM Data

Idle/Unlock/Lock

Idle

Door Cylinder Switch

BCM Data

Volts

Varies

Driver Door Ajar Switch

BCM Data

Door Closed/Door Ajar

Door Closed

Horn Relay Command

BCM Data

On/Off

Off

Security Indicator Command

BCM Data

On/Off

Off

Trunk Ajar Switch

BCM Data

Trunk Closed/Trunk Ajar

Trunk Closed

Theft Deterrent Module (TDM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON, Engine OFF

Auto Learn Counter

Module Data

Counts

Varies

Auto Learn Timer

Module Data

Minutes

0-10

Battery Voltage Signal

Module Data

Volts

Varies

Battery Voltage Cycled

Module Data

Yes/No

No

Fail Enable Counter

Module Data

Counts

0-3

Ignition Voltage Signal

Module Data

Volts

Varies

Master Keys Learned

Key Data

Counts

0-10

PCM Auto. Learn Timer

Powertrain Status

Minutes

0-10

PCM Fail Enable

Powertrain Status

Active/Inactive

Inactive

PCM Fuel Continue

Powertrain Status

Active/Inactive

Active

PCM Password Learning

Powertrain Status

Active/Inactive

Inactive

Power Mode

Module Data

Off/Accessory/Run/Crank Request

Run

Substitution Timer

Module Data

Minutes

0-10

Tamper Status

Module Data

Yes/No

No

Telltale Status

Module Data

On/Off

Off

Total Keys Learned

Key Data

Counts

Varies

Transponder Key

Key Data

Present/Not Present

Present

TDM Fail Enable

Module Data

Yes/No

Yes

TDM States

Module Data

Ignition Off/Normal Decision/Learn First Key/Tamper/Monitor Key/Fail Enable/Seedkey Lrn Pend/Seedkey Learn/Auto Learn Pend/Auto Learn/Wakeup/Learn More Keys/No Coded Key/Check Second Key/Auto Lrn Done/Vin Check/Vin Timer

Monitor Key

Valid Key

Key Data

Yes/No

Yes

VIN Message Received

Module Data

Yes/No

Yes