Tire pressure monitor (TPM [RDK]) messages - GF40.15-P-0001-08CEA
The tire pressure monitor (TPM [RDK]) system messages are shown in the multifunction display (A1p13) of the instrument cluster (A1). Depending on the warning message, the tire pressure monitor warning lamp (A1e66) is also continuously actuated.
In the event of a malfunction of the tire pressure monitor system, the tire pressure monitor warning lamp in the IC flashes for t = 60 s. Then it will be actuated permanently.
In the event of messages in the IC a distinction is made between the following two types:
- Menu displays
- Warning messages
The menu displays in the instrument can be called up via the system selection button (S110s3) and via the forward and back button (S110s1) in the left multi function steering wheel button group (S110) in the Service menu and in the Tire Pressure submenu.
Warning messages are issued automatically.
Menu display 1
The TPM [RDK] system is not available until "circuit 15 ON" status.
Menu display 2
Normal condition, display of pressure display:
- No fault
- Vehicle wheels detected and assigned to positions
- Current pressure signals are available
Manual restart is possible.
Menu display 3
The TPM [RDK] system is nonfunctional. Possible causes are:
- Instrument cluster not receiving any valid chassis CAN (CAN E) signals from tire pressure monitor control unit (N88)
- Tire pressure monitor control unit nonfunctional:
- Shutoff because of malfunction
- Failure of left front tire pressure sensor (A69/1), right front tire pressure sensor (A69/2), left rear tire pressure sensor (A69/3) or right rear tire pressure sensor (A69/4) because of excess temperature
Menu display 4
TPM [RDK] system in diagnosis mode.
Menu display 5
Status display of TPM [RDK] system after ignition restart ("Circuit 15 ON" status). There are still no high frequency (HF) signals (433 MHz) available from the left front tire pressure sensor, right front tire pressure sensor, left rear tire pressure sensor and right rear tire pressure sensor. When the wheels are already known to the system, the pressure picture appears shortly after the start of a trip. It can take a few minutes until the position identification is learnt with new wheels.
A manual restart is possible by pressing the scroll forward and back button in the lower subfield and then the OK n/button(S110s6).
Menu display 6
Status picture of tire pressure monitor system when restarting manually by pressing the scroll forward and back button in the lower subfield and then the ON button. n/
Warning message 1
The TPM [RDK] system is nonfunctional. Possible causes are:
- Instrument cluster not receiving any valid chassis CAN signals from tire pressure monitor control unit
- Tire pressure monitor control unit nonfunctional (shutoff of tire pressure monitor system on account of malfunction)
In the event of a malfunction of the tire pressure monitor system, the tire pressure monitor warning lamp in the IC flashes for t = 60 s. Then it will be actuated permanently. Following the next ignition sequence, this procedure will repeat itself until the fault is eliminated.
Warning message 2
The tire pressure monitor has detected a significant pressure loss in one or more tires (p < p_specified -20 %). The wheel position is not assigned.
The tire pressure monitor warning lamp is actuated permanently and an acoustic message takes place.
Warning message 3
The tire pressure monitor system has detected a rapid pressure loss in one or more tires (dp/dt > 0.2 bar/min). The corresponding wheel position is assigned.
The tire pressure monitor warning lamp is actuated permanently and an acoustic message takes place.
Warning message 4
The tire pressure monitor control unit is unable to receive signals from the tire pressure sensors.
Possible cause: Wheels without tire pressure sensor are fitted.
In the event of a malfunction of the tire pressure monitor system, the tire pressure monitor warning lamp in the IC flashes for t = 60 s. Then it will be actuated permanently. Following the next ignition sequence, this procedure will repeat itself until the fault is eliminated.
Warning message 5
The TPM [RDK] system is temporarily inactive because of transmission interference or because the voltage is too high/low.
In the event of a malfunction of the tire pressure monitor system, the tire pressure monitor warning lamp in the IC flashes for t = 60 s. Then it will be actuated permanently. Following the next ignition sequence, this procedure will repeat itself until the fault is eliminated.
Warning message 6
Operation feedback after manual restart.
Warning message 7
Request for pressure correction.