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 OFF

Battery Voltage Signal

BCM, Power Mode

Volts

12.6 Volts

Idle Boost Level

BCM, Power Mode

Amps

0 Amps

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, Keyless/Remote Start Data

On/Off

On

LX9 Powertrain Control Module (PCM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine OFF

Crank Request Signal

Engine Electrical, PCM

Yes/No

No

GEN Lamp Command

Engine Electrical, PCM

On/Off

Off

GEN L-Terminal Signal Command

Engine Electrical, PCM

On/Off

Off

Ignition 1 Signal

Engine Electrical, PCM

Volts

12.6 V

Starter Relay Command

Engine Electrical, PCM

On/Off

Off

Starter Relay Circuit History

Engine Electrical, PCM

OK/Open/Short/Invalid State

OK

TR Sw.

PCM, 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

Ignition ON/Engine OFF

GEN F-Terminal Signal

Engine Electrical, ECM

Percent

30 Percent

GEN L-Terminal Circuit Status

Engine Electrical, ECM

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

OK

GEN L-Terminal Command

Engine Electrical, ECM

Percent

20 Percent

Ignition 1 Signal

Engine Electrical, ECM

Volts

12.6 V

Starter Relay Command

Engine Electrical, ECM

ON/OFF

OFF

Starter Relay Circuit Status

Engine Electrical, ECM

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

OK

LZ9 Transmission Control Module (TCM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

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, Neutral, Reverse\Neutral, Drive 1, Drive 2\Drive 1, Open

Park

LE5 Engine Control Module (ECM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine OFF

Crank Request Signal

Engine Electrical, ECM

Yes/No

No

GEN F-Terminal Signal

Engine Electrical, ECM

%

0 %

GEN L-Terminal Circuit Status

Engine Electrical, ECM

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

OK

GEN L-Terminal Signal Command

Engine Electrical, ECM

On/Off

Off

Ignition 1 Signal

Engine Electrical, ECM

Volts

12.6 Volts

Starter Relay Circuit Status

Engine Electrical, ECM

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

OK

Starter Relay Command

Engine Electrical, ECM

On/Off

Off

LE5 Transmission Control Module (TCM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine OFF

TR Sw.

Automatic Transaxle, Data Display, TCM, Transmission Data

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

Park