TPM [RDK] control unit, component description - GF40.15-P-5123GM

MODEL 164.1 with CODE (470) Tire pressure monitor (base) with CODE (475) Tire pressure monitor (premium) as of model year 2009 up to model year 2010/CY 08 model refinement package,/CY 09, Siemens

MODEL 164.8 with CODE (470) Tire pressure monitor (base) with CODE (475) Tire pressure monitor (premium) as of model year 2009 up to model year 2010/modification year 08,/modification year 09 model refinement package, Siemens

MODEL 251.0/1 with CODE (470) Tire pressure monitor (base) with CODE (475) Tire pressure monitor (premium) as of model year 2009 up to model year 2010/modification year 08,/modification year 09, Siemens

Shown on model 164.1

Fig 1: Identifying TPM (RDK) Control Unit Component - Shown On Model 164.1

Courtesy of MERCEDES-BENZ USA

Location

The TPM [RDK] control unit is located in the right of the trunk in the wheel arch.

Task

The TPM [RDK] control unit has the following tasks:

Reading in of sensors and signals
Evaluation of input factors
Actuation of components

Reading in of sensors and signals

The input factors are read in with the following connections:

Direct line
Interior CAN (CAN B)

Direct line

The following sensors are read in via a direct line:

Central TPM [RDK] antenna (A2/97)

Interior CAN

The following signals are read in over the interior CAN:

Vehicle speed signal, from instrument cluster (A1)
Outside air temperature, from AAC [KLA] control and operating unit (N22) (without code (581) Comfort automatic air conditioning) or from comfort AAC control and operating unit (N22/7) (with code (581) Comfort automatic air conditioning)
Circuit 61, from front SAM control unit (N10)
Circuit 15, from EIS [EZS] control unit (N73)
Country code, engine/body variant and diagnosis active, from central gateway control unit (N93)
Signal from steering angle sensor (N49), from steering column tube module (N80)

Evaluation of input factors

The input factors that have been read in are evaluated by the integrated microprocessor and the relevant components are then actuated.

Actuation of components

Components are actuated with the following lines:

Local Interconnect Network (LIN)
Interior CAN

LIN

The following components are actuated via LIN:

Left rear TPM wheel antenna (A2/46) (with code (475) Tire pressure monitor (Premium))
Right rear TPM wheel antenna (A2/47) (with code (475) Tire pressure monitor (Premium))

Interior CAN

The following components are actuated via the interior CAN:

Menu displays and warning messages in instrument cluster

Variants

The TPM [RDK] control unit is used for two versions of the system:

Vehicles with code (470) Tire pressure monitor (standard)
Vehicles with code (475) Tire pressure monitor (premium)

The same control unit is used for both versions.

Wiring diagram for tire pressure monitor control unit	Model 164 Without code (494) USA version	PE40.15-P-2101-99MAA
	Model 164 With code (494) USA version	PE40.15-P-2101-99MAB
	Model 251 Without code (494) USA version	PE40.15-P-2101-99RAA
	Model 251 With code (494) USA version	PE40.15-P-2101-99RAB