-1- J502 Tyre pressure monitor control unit

 

-2- Belt buckle

 

Fitting location:

Under rear seat bench at rear left.

 

 

Installing and removing:

Pull rear seat bench upwards out of retainers.

 

J502 Tyre pressure monitor control unit

Procedure for replacing control unit -J502:

After installing control unit -J502 the tyre pressure monitoring system must be recoded.

IRemoving and installing the control unit:

ELSA Running Gear, Front-wheel drive and four-wheel drive; Rep.Gr.44

ICoding control unit:

 in Guided Fault Finding

Choose Go To - Function and component selection, and under Functions select test

J502 - Code control unit

The specified pressures are given on the back of the tank cap or in the Wheels and Tyres guide

Two different pressures are indicated in the part-loaded and fully loaded states. The lowest values must always be entered.

Control unit coding:

The first digit is always a 2 (Audi)

Perform control unit coding with function 07 (for coding see table below).

 

Coding table

Coding 0?xxxxx: Manufacturer 2 = Audi 0x?xxxx: Type 0 = System Disabled 1 = Rest of World (RoW) @ 433 MHz 2 = Rest of World (RoW) @ 315 MHz 3 = North American Region (NAR) @ 433 MHz 4 = North American Region (NAR) @ 315 MHz 5 = Rest of World (RoW) @ 433 MHz with Run Flat Tires 6 = Rest of World (RoW) @ 315 MHz with Run Flat Tires 0xx?xxx: Partial Load I 1 = 1.x bar 2 = 2.x bar 3 = 3.x bar 0xxx?xx: Partial Load II 0 = x.0 bar 1 = x.1 bar 2 = x.2 bar 3 = x.3 bar 4 = x.4 bar 5 = x.5 bar 6 = x.6 bar 7 = x.7 bar 8 = x.8 bar 9 = x.9 bar 0xxxx?x: Full Load I 1 = 1.x bar 2 = 2.x bar 3 = 3.x bar 0xxxxx?: Full Load II 0 = x.0 bar 1 = x.1 bar 2 = x.2 bar 3 = x.3 bar 4 = x.4 bar 5 = x.5 bar 6 = x.6 bar 7 = x.7 bar 8 = x.8 bar 9 = x.9 bar

 

e.g. code 212230 signifies

Audi; with carrier frequency 433MHz;

Specified pressure part loaded 2.2 bar

Specified pressure fully loaded 3.0 bar

Values lower than 1.7 bar are not permitted in the code

At actual pressure < minimum pressure the warning lamp priority 2 in the dash panel insert is activated

 

 

MMI- operating and display unit front

By way of the function selector switch, in the Tyre Pressure submenu the tyre pressure monitoring system can be deactivated and reactivated and the current tyre pressures stored.

 

The tyre inflation pressure, wheel electronics and temperature measured values are indicated with the relevant positions.

 

The MMI includes a fault message: System fault - tyre pressure monitoring.

 

Reading measured value block

 

Measured value block 001:  

• Wheel_FL or no readout
• Temperature (readout on tester: Temperature in °C or text: n.recognised)
• Actual pressure (readout on tester: Pressure in bar)
• Specified pressure (readout on tester: Pressure in bar)

  Measured value block 002:

• Wheel_FL or no readout
• 0-99 Mon (remaining life of battery in wheel electronics in months)
• Voltage (voltage condition of battery in wheel electronics) 
• OK or n.OK

Measured value block 003:

• Wheel_FL or no readout

Measured value block 004:

• Wheel_FR or no readout
• Temperature (readout on tester: Temperature in °C or text: n.recognised)
• Actual pressure (readout on tester: Pressure in bar)
• Specified pressure (readout on tester: Pressure in bar)

  Measured value block 005:

• Wheel_FR or no readout
• 0-99 Mon (remaining life of battery in wheel electronics in months)
• Voltage (voltage condition of battery in wheel electronics) 
• OK or n.OK

Measured value block 006:

• Wheel_FR or no readout

Measured value block 007:

• Wheel_RL or no readout
• Temperature (readout on tester: Temperature in °C or text: n.recognised)
• Actual pressure (readout on tester: Pressure in bar)
• Specified pressure (readout on tester: Pressure in bar)

  Measured value block 008:

• Wheel_RL or no readout
• 0-99 Mon (remaining life of battery in wheel electronics in months)
• Voltage (voltage condition of battery in wheel electronics) 
• OK or n.OK

Measured value block 009:

• Wheel_RL or no readout

Measured value block 010:

• Wheel_RR or no readout
• Temperature (readout on tester: Temperature in °C or text: n.recognised)
• Actual pressure (readout on tester: Pressure in bar)
• Specified pressure (readout on tester: Pressure in bar)

Measured value block 011:

• Wheel_RR or no readout
• 0-99 Mon (remaining life of battery in wheel electronics in months)
• Voltage (voltage condition of battery in wheel electronics) 
• OK or n.OK

Measured value block 012:

• Wheel_RR or no readout

Measured value block 013:

• Spare wheel no readout
• Temperature (readout on tester: Temperature in °C or text: n.recognised)
• Actual pressure (readout on tester: Pressure in bar)
• Specified pressure (readout on tester: Pressure in bar)

Measured value block 014:

• Spare wheel no readout
• 0-99 Mon (remaining life of battery in wheel electronics in months)
• Voltage (voltage condition of battery in wheel electronics) 
• OK or n.OK

Measured value block 015:

• JSpare wheel no readout

Measured value block 016:

• Digits 1-14 = Identification of wheel electronics
• Digits 15-25 = Status byte (hexadecimal)
• Digits 26-33 = UB OK: or UB n.OK (wheel electronics battery status)
• Digits 34-40 = Actual pressure in bar

e.g. 0.001.639.522. Status 01h UB.OK 2.17bar

Measured value block 017:

• Offset aerial FL (readout on tester 0-5.1 Volt)
• Offset aerial FR (readout on tester 0-5.1 Volt)
• Offset aerial RL (readout on tester 0-5.1 Volt)
• Offset aerial RR (readout on tester 0-5.1 Volt)

Measured value block 018:

• Level aerial FL (readout on tester 0-5.1 Volt)
• Level aerial FR (readout on tester 0-5.1 Volt)
• Level aerial RL (readout on tester 0-5.1 Volt)
• Level aerial RR (readout on tester 0-5.1 Volt)

Measured value block 019:

• System status digits 1-10
• Vehicle status digits 11-20
• Warning status digits 21-40
• e.g. 0109h  0001h   0000h    00h    00h

Measured value block 020:

• One-wire or two-wire (convenience system CAN bus)

Measured value block 021:

• Speed signal (readout on tester in Km/h)
• ABS 1 or ABS 0 (drive train CAN)
• Engine speed (readout on tester rpm)
• Engine 1 or Engine 0 (drive train CAN)

Measured value block 022:

• Ambient temperature (readout on tester in °C)
• Climate 1 or Climate 0 (drive train CAN)
• Term.15 ON or Term.15 OFF
• Voltage at control unit (readout in Volts)

Measured value block 023:

• Door open or door closed (driver door)
• Load (readout on tester load in °C)
• Level 1 or level 0 (drive train CAN bus)
• Gateway 1 or gateway 0 (Most CAN bus)

Measured value block 024:

• Digits 1-13 = Part no., aerial FL
• Digits 13-15 = Blank
• Digits 16-29 = Part no., aerial FR

Measured value block 025:

• Digits 1-13 = Part no., aerial RL
• Digits 13-15 = Blank
• Digits 16-29 = Part no., aerial RR

Measured value block 026:

• 0.0 - 180 s (countdown for BE active; end at 0.0 seconds)

Measured value block 027:

• Digits 1-8     = Reception FL
• Digits 9-16     = Reception FR
• Digits 17-24     = Reception RL
• Digits 25-32     = Reception RR
• Digits 33-40     = Reception RR

Measured value block 028:

• Digits 1-8     = Non-reception FL
• Digits 9-16     = Non-reception FR
• Digits 17-24     = Non-reception RL
• Digits 25-32     = Non-reception RR
• Digits 33-40     = Non-reception RR

Measured value block 080:

• Manufacturer works number and identifier
• Date of manufacture
• Manufacturer modification status
• Manufacturer test status no.
• Manufacturer serial no.

Manufacturer works number

The manufacturer works code

kkk is used for unique tracing of a manufacturer (secondary) works, but can be

freely selected, e.g. "000" can be entered if necessary.

Manufacturer serial no. is 4-digit and provides unique identification of the control unit.