GM Service Manual Online
For 1990-2009 cars only

Body Control Module (BCM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine Running

Battery Voltage

Data

Volts

12.6 Volts

Regulated Voltage Control Current Sensor

Data

%

0 %

Starter Switch

Inputs

On/Off

Off

Instrument Panel Cluster (IPC)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine Running

Battery Voltage

Data

Volts

12.6 Volts

Powertrain Control Module (PCM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine OFF/Transmission in Park

Crank Request Signal

Data

Yes/No

No

GEN F-Terminal Signal

Data

%

45%

GEN L-Terminal Signal Command

Data

On/Off

OFF

Ignition 1 Signal

Data

Volts

12.6 Volts

IMS

Transmission Data

Drive 3, Drive 4\Drive 3, Park\Reverse, Reverse, Drive 3\Drive 2, Drive 2, Park, Invalid, Neutral\Drive 4, Drive 4, Neutral, Reverse\Neutral, Drive 1, Drive 2\Drive 1, Invalid, Open

Park

Starter Relay Circuit History

Data

OK/Open/Short/Invalid

OK

Starter Relay Command

Data

On/Off

Off

Engine Control Module (ECM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine OFF/Transmission in Park

Crank Request Signal

Data

Yes/No

No

Current Gear

Data

P/N, 1st, 2nd, 3rd, 4th, 5th, Reverse

P/N

GEN F-Terminal Signal

Data

%

45 %

GEN L-Terminal Signal Command

Data

%

10%

Ignition 1 Signal

Data

On/Off

Off

IMS

Transmission Data

Drive 3, Drive 4\Drive 3, Park\Reverse, Reverse, Drive 3\Drive 2, Drive 2, Park, Invalid, Neutral\Drive 4, Drive 4, Neutral, Reverse\Neutral, Drive 1, Drive 2\Drive 1, Invalid, Open

Park

PNP Switch

Data

Park/Neutral, In Gear

Park/Neutral

RVS Disable 1 History

Data

None/RPM Too High/Coolant Hot/Crank Abort/EOP Low/Crank Time/MIL On/Backup Timer/APP Too High/Not In Park/VSS Active/VTD Disable

None

RVS Disable 2 History

Data

None/RPM Too High/Coolant Hot/Crank Abort/EOP Low/Crank Time/MIL On/Backup Timer/APP Too High/Not In Park/VSS Active/VTD Disable

None

RVS Disable 3 History

Data

None/RPM Too High/Coolant Hot/Crank Abort/EOP Low/Crank Time/MIL On/Backup Timer/APP Too High/Not In Park/VSS Active/VTD Disable

None

RVS Disable 4 History

Data

None/RPM Too High/Coolant Hot/Crank Abort/EOP Low/Crank Time/MIL On/Backup Timer/APP Too High/Not In Park/VSS Active/VTD Disable

None

RVS Disable 5 History

Data

None/RPM Too High/Coolant Hot/Crank Abort/EOP Low/Crank Time/MIL On/Backup Timer/APP Too High/Not In Park/VSS Active/VTD Disable

None

RVS Disable 6 History

Data

None/RPM Too High/Coolant Hot/Crank Abort/EOP Low/Crank Time/MIL On/Backup Timer/APP Too High/Not In Park/VSS Active/VTD Disable

None

RVS Disable 7 History

Data

None/RPM Too High/Coolant Hot/Crank Abort/EOP Low/Crank Time/MIL On/Backup Timer/APP Too High/Not In Park/VSS Active/VTD Disable

None

RVS Disable 8 History

Data

None/RPM Too High/Coolant Hot/Crank Abort/EOP Low/Crank Time/MIL On/Backup Timer/APP Too High/Not In Park/VSS Active/VTD Disable

None

Starter Relay Command

Data

On/Off

Off