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

Battery Voltage

BCM, Keyless Remote Start Data

Volts

12.6 Volts

Battery Voltage Signal

BCM, Power Mode

Volts

12.6 Volts

Power Mode

BCM, Power Mode

Off, Accessory, Run, Crank Request

Off

Run/Crank Relay

BCM, Keyless/Remote Start Data

On/Off

On

Run/Crank Relay Command

BCM, Power Mode

On/Off

On

Run/Crank Relay Command

BCM, Keyless/Remote Start Data

On/Off

On

LE5 Engine Control Module (ECM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON/Engine OFF

Crank Request Signal

ECM, Electrical/Theft Data

Yes/No

No

GEN L-Terminal Circuit Status

ECM, Electrical/Theft Data

Incomplete, Short Gnd/Open, Short to B+, OK

OK

GEN F-Terminal Signal

ECM, Electrical/Theft Data

Percent

90 Percent

Ignition 1 Signal

ECM, Electrical/Theft Data

Volts

12.6 V

Starter Relay Circuit Status

ECM, Electrical/Theft Data

Incomplete, Short Gnd/Open, Short to B+, OK

OK

Starter Relay Command

ECM, Electrical/Theft Data

On/Off

Off

LE5 Transmission Control Module (TCM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON/Engine OFF

TR Sw.

Automatic Transaxle, Data Display, TCM, Transmission Data

Drive 1, Drive2, Drive 3, Drive 4, Neutral, Reverse, Park, Invalid

Park

LZ9 Engine Control Module (ECM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON/Engine OFF

Crank Request Signal

ECM, Electrical/Theft Data

Yes/No

No

Clutch Start Switch

ECM, Electrical/Theft Data

Released/Applied

Released

GEN F-Terminal Signal

ECM, Electrical/Theft Data

Percent

30 Percent

GEN L-Terminal Circuit Status

ECM, Electrical/Theft Data

Incomplete, Short, GND/Open, Short to B+, OK

OK

GEN L-Terminal Command

ECM, Electrical/Theft Data

Percent

20 Percent

Ignition 1 Signal

ECM, Electrical/Theft Data

Volts

12.6 V

Starter Relay Command

ECM, Electrical/Theft Data

ON/OFF

OFF

Starter Relay Circuit Status

ECM, Electrical/Theft Data

Incomplete, Short, GND/Open, Short to B+, OK

OK

LZ9 Transmission Control Module (TCM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON/Engine OFF

IMS

Automatic Transaxle, Data Display, TCM, Transmission Data

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

Park

LZ4 Engine Control Module (ECM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON/Engine OFF

Crank Request Signal

ECM, Electrical/Theft Data

Yes/No

No

GEN F-Terminal Signal

ECM, Electrical/Theft Data

Percent

0 Percent

GEN L-Terminal Command

ECM, Electrical/Theft Data

Percent

90 Percent

GEN L-Terminal Circuit Status

ECM, Electrical/Theft Data

Incomplete, Short Gnd / Open, Short to B+, OK

OK

Ignition 1 Signal

ECM, Electrical/Theft Data

Volts

12.6 Volts

Starter Relay Circuit Status

ECM, Electrical/Theft Data

Incomplete, Short Gnd / Open, Short to B+, OK

OK

Starter Relay Command

ECM, Electrical/Theft Data

On/Off

Off

LZ4 Transmission Control Module (TCM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON/Engine OFF

TR Sw.

TCM, Data Display, Transmission Data

Park, Reverse, Neutral, Drive 5, Drive 4, Drive 3, Drive 2, Drive 1

Park

LY7 Engine Control Module (ECM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON/Engine OFF

Crank Request Signal

ECM, Electrical/Theft Data

Yes/No

No

GEN F-Terminal Signal

ECM, Electrical/Theft Data

Percent

30 Percent

GEN L-Terminal Circuit Status

ECM, Electrical/Theft Data

Fault, Intermediate, OK

OK

Ignition 1 Signal

ECM, Electrical/Theft Data

Volts

12.6 V

Starter Relay Command

ECM, Electrical/Theft Data

ON/OFF

OFF