Use a scan tool to display the BCM data. This information assists in determining whether the BCM is operating properly and whether the BCM is sending or receiving the proper data to and from a particular system. The BCM uses data received from other systems in order to carry out some functions. Therefore, if the BCM receives the incorrect data from another system, the BCM may function improperly. Use the scan tool in order to review the data from systems that interact with the BCM.
The scan tool also displays the BCM input status. Select the BCM input status display in order to display the data and determine if the switched inputs can be properly interpreted. The display also indicates if the input has changed states. For example, when a door is closed, the scan tool displays the input status of the door ajar switch as INACTIVE. When the door is open, the scan tool reads ACTIVE. Use this kind of information when diagnosing a malfunction associated with a particular BCM input or an input that is shared with another system.
Use a scan tool in order to cycle the BCM output functions. When the BCM output cycling is selected, the scan tool can command the BCM to cycle an output. This feature can be used to determine if the BCM is able to cycle an output regardless of the inputs or any specific program instructions. Once a test is selected, the scan tool will command the BCM to energize the selected output. The scan tool then displays the status of the selected output. The displayed information represents only what was BCM commanded, not what action was actually taken. Check if the BCM is actually preforming each of the selected output functions.
Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
---|---|---|---|
Ignition ON/Doors, Hatch/Trunk and Hood Closed/No Switches On or Pressed/Vehicle in Park | |||
Controller Part Number | Module Info 1 | Part Number | Varies |
EEPROM Calibration ID | Module Info 1 | Calibration Number 0-255 | Varies |
Hardware Version | Module Info 2 | Version Number 0-255 | Varies |
Software Major Version | Module Info 2 | Version Number 0-255 | Varies |
Software Minor Version | Module Info 2 | Version Number 0-255 | Varies |
Calibration Version | Module Info 2 | Version Number 0-255 | Varies |
Battery Volts | Data | 0-16.0 Volts | Battery Voltage |
PassKey Resister Signal | Data | 0-5.0 Volts | Varies |
PRNDL Illumination | Data | 0-100% | Varies with Dimming Level |
HVAC Bulb Illumination | Data | 0-100% | Varies with Dimming Level |
Console Switch Illumination | Data | 0-99.9% | Varies with Dimming Level |
Fog Light Illumination | Data | 0-100% | Varies with Dimming Level |
Ignition 1 | Input Data 1 | On/Off | On |
Ignition 2 | Input Data 1 | On/Off | On |
Ignition 3 | Input Data 1 | On/Off | On |
Key In Ignition | Input Data 1 | Active/Inactive | Active |
Key Out of Ignition | Input Data 1 | Active/Inactive | Varies |
Current Power Mode | Input Data 1 | Power Mode | Run |
Inadvertent Load Monitor | Input Data 1 | Active/Inactive | Inactive |
Theft Deterrent State | Input Data 1 | Current State | Varies |
PASS-Key State | Input Data 1 | Current State | Monitor PassKey |
Front Fog Light Switch | Input Data 1 | Active/Inactive | Inactive |
Rear Fog Light Switch | Input Data 1 | On/Off | Off |
Right Turn Signal Monitor | Input Data 1 | Active/Inactive | Inactive |
Right Turn Signal Relay | Input Data 1 | Active/Inactive | Inactive |
Left Turn Signal Monitor | Input Data 1 | Active/Inactive | Inactive |
Left Turn Signal Relay | Input Data 1 | Active/Inactive | Inactive |
Backup Light Request | Input Data 1 | Yes/No | No |
Driver Door Ajar Switch | Input Data 2 | Open/Closed | Closed |
Passenger Door Ajar Switch | Input Data 2 | Open/Closed | Closed |
Hood Ajar (export) | Input Data 2 | Open/Closed | Closed |
Hatch/Trunk Ajar Switch | Input Data 2 | Open/Closed | Closed |
Hatch/Trunk Release Switch | Input Data 2 | Active/Inactive | Inactive |
Tonneau Ajar Switch | Input Data 2 | Open/Closed | Closed |
Tonneau Release Switch | Input Data 2 | Active/Inactive | Inactive |
Column Lock State | Input Data 2 | Current State | Ignition On Unlocked |
Column Feedback | Input Data 2 | Active/Inactive | Active |
Column Lock/Unlock A | Input Data 2 | Active/Inactive | Inactive |
Column Lock/Unlock B | Input Data 2 | Active/Inactive | Inactive |
Horn Relay Feedback | Input Data 2 | Active/Inactive | Inactive |
TCS Switch | Input Data 2 | Active/Inactive | Inactive |
HVAC Rear Defogger Switch | Input Data 2 | Active/Inactive | Inactive |
Rear Defogger Relay | Input Data 2 | Active/Inactive | Inactive |