A scan tool is a very useful tool and must be used when referred to throughout this section. In addition to displaying DTCs, the scan tool is capable of displaying input status and the data values the RFA system uses to perform certain functions. It is also capable of sending specific commands to other systems to determine if the malfunction is due to the RFA system not sending a proper command, or the system that received the command is not responding to the command. Using the driver door lock system function as an example, sending a door lock or unlock message to the driver Door Control Module (DCM) to cycle the door lock can determine if the DCM can actually perform the door lock/unlock function. If the DCM are functioning properly and the RFA system is still unable to operate the door locks then the problem is most likely with the RFA system, or an input to the RFA system.

The scan tool can also be used to display input data the RFA system borrows from other systems on the serial data line. This can assist in determining if the RFA system is actually receiving the correct data values. For example, if the DCMs can properly operate the door locks but the RFA system cannot, the problem could be with the input information the RFA system receives from the Body Control Module (BCM). The RFA system uses key in ignition information from the BCM to determine if the key is IN or OUT of the ignition. Refer to Keyless Entry System Description for input information the RFA system uses to perform its functions.

RFA/TPM Scan Tool Data List

Scan Tool Parameter	Data List	Units Displayed	Typical Data Value
Turn the Ignition ON//Valid Transmitter in Range/No Switches Pressed
Point of Sale	Module Information	Country	Varies
Software ID	Module Information	ID #	Varies
Key In Ignition	RFA Information	Yes/No	Yes
Invalid Key Fob	RFA Information	Yes/No	Varies
Valid Key Fob	RFA Information	Yes/No	Varies
Keyless Entry Option	RFA Information	On/Off	On
Current Power Mode	RFA Information	Power Mode	Varies
Class 2 Disable	RFA Information	Yes/No	No
Programmed Key Fobs	RFA Information	# of Programmed Key Fobs	1-3
LF Tire Pressure	Tire Pressure Data	0-1020 kPa (0-148 psi)	1020 kPa (148 psi) Until vehicle is driven and tire pressure data is received
LR Tire Pressure	Tire Pressure Data	0-1020 kPa (0-148 psi)	1020 kPa (148 psi) Until vehicle is driven and tire pressure data is received
RF Tire Pressure	Tire Pressure Data	0-1020 kPa (0-148 psi)	1020 kPa (148 psi) Until vehicle is driven and tire pressure data is received
RR Tire Pressure	Tire Pressure Data	0-1020 kPa (0-148 psi)	1020 kPa (148 psi) Until vehicle is driven and tire pressure data is received
LF Tire Status	Tire Information	Data Pending/OK	Data Pending Until Vehicle is Driven
RF Tire Status	Tire Information	Data Pending/OK	Data Pending Until Vehicle is Driven
RR Tire Status	Tire Information	Data Pending/OK	Data Pending Until Vehicle is Driven
LR Tire Status	Tire Information	Data Pending/OK	Data Pending Until Vehicle is Driven

RFA/TPM Scan Tool Data Definitions:

The RFA/TPM Scan Tool Data Definitions contains a brief description of all RFA/TPM related parameters available on the scan tool.

Point of Sale:: The scan tool displays the country the vehicle was sold in.

Software ID:: The scan tool displays the receiver software ID number for service identification.

Key In Ignition:: The scan tool displays Yes or No. The RFA system receives this information on the serial data line from the BCM. When the key is IN the ignition switch, the scan tool will display Yes. When the key is removed from the ignition switch, the scan tool will No.

Invalid Key Fob:: The scan tool displays Yes or No. If an invalid transmitter is within range, and a button is pressed, the scan tool will display Yes. If a valid transmitter is in range, and a button is pressed, the scan tool will display No.

Valid Key Fob:: The scan tool displays Yes or No. If an valid transmitter is in range, and a button is pressed, the scan tool will display Yes. If an invalid transmitter is in range, and a button is pressed, the scan tool will display No.

Keyless Entry Option:: The scan tool displays On or Off. This information is programmed into the BCM RPO content and sent on the serial data line. If the keyless entry option is programmed into the BCM, the scan tool will display Yes. If not, the scan tool will display No.

Current Power Mode:: The scan tool displays the current power mode. The BCM determines ignition switch position from it's ignition inputs. This ignition switch information is sent on the serial data line to systems that relay on this information to preform certain functions (RAP, wake-up, etc.).

Class 2 Disable:: The scan tool displays Yes or No. If the RFA system cannot communicate on the serial data line, the scan tool will display Yes. If the RFA system cannot communicate, the scan tool will display No.

Programmed Key Fobs:: The scan tool displays 1 to 3. The scan tool displays the amount of valid transmitters programmed in the keyless entry receiver.

LF Tire Pressure:: The scan tool displays 0-1020 kPa (0-148 psi). The scan tool displays tire pressure data received from the LF tire pressure sensor. The scan tool will display 1020 kPa (148 psi) until the vehicle is driven and LF tire pressure sensor information is received.

LR Tire Pressure:: The scan tool displays 0-1020 kPa (0-148 psi). The scan tool displays tire pressure data received from the LR tire pressure sensor. The scan tool will display 1020 kPa (148 psi) until the vehicle is driven and LR tire pressure sensor information is received.

RF Tire Pressure:: The scan tool displays 0-1020 kPa (0-148 psi). The scan tool displays tire pressure data received from the RF tire pressure sensor. The scan tool will display 1020 kPa (148 psi) until the vehicle is driven and RF tire pressure sensor information is received.

RR Tire Pressure:: The scan tool displays 0-1020 kPa (0-148 psi). The scan tool displays tire pressure data received from the RR tire pressure sensor. The scan tool will display 1020 kPa (148 psi) until the vehicle is driven and RR tire pressure sensor information is received.

LF Tire Status:: The scan tool displays Data Pending or OK. The scan tool displays Data Pending until the vehicle is driven and LF tire pressure sensor information is received. When LF tire pressure information is received, the LF tire status will change to OK.

RF Tire Status:: The scan tool displays Data Pending or OK. The scan tool displays Data Pending until the vehicle is driven and RF tire pressure sensor information is received. When RF tire pressure information is received, the RF tire status will change to OK.

RR Tire Status:: The scan tool displays Data Pending or OK. The scan tool displays Data Pending until the vehicle is driven and RR tire pressure sensor information is received. When RR tire pressure information is received, the RR tire status will change to OK.

LR Tire Status:: The scan tool displays Data Pending or OK. The scan tool displays Data Pending until the vehicle is driven and LR tire pressure sensor information is received. When LR tire pressure information is received, the LR tire status will change to OK.