Inspection of TPMS Control Module and Its Circuits
Precautions: Precautions for Diagnosing Trouble · Precautions for Control Systems · General safety (00)
Voltage and Signal Check
Check voltage and/or pulse signal of TPMS control module (1) using voltmeter (2) and oscilloscope (3).
NOTE:
•Check that battery voltage is 12 V or more.
•The voltage of terminal with asterisk (*) cannot be measured by voltmeter because it is pulse signal. Check it with oscilloscope if necessary.
•The voltage of terminal with asterisk (*) cannot be measured by voltmeter because it is pulse signal. Check it with oscilloscope if necessary.
| [A]: | TPMS control module connector (View: [a]) |
“L306” connector
| Terminal No. | Wire color | Circuit | Normal voltage | Condition |
|---|---|---|---|---|
| L306-1 | — | — | — | — |
| L306-2 | BLK | Ground for TPMS control module | Approx. 0 V | — |
| L306-3* | WHT | CAN communication line (low) | Refer to CAN communication signal. | |
| L306-4* | RED | CAN communication line (high) | ||
| L306-5 | BLU | Ignition power supply | 10 – 14 V | Ignition: “ON” |
| Approx. 0 V | Other than above condition | |||
| L306-6 | RED | Power supply | 10 – 14 V | — |
Reference Waveform
Oscilloscope display
Shown below is typical waveform display provided by oscilloscope.
NOTE:
•How to read waveforms is shown below.
•Waveform varies depending on measurement condition and vehicle spec.
| [a]: | Waveform of channel 1 | [c]: | VOLT/DIV of each channel |
| [b]: | Ground level of each channel | [d]: | TIME/DIV |
CAN communication signal
CAN communication signal (High) (1)
| Channel | Probe | Terminal No. |
|---|---|---|
| 1 | + | L306-4 |
| – | L306-2 |
CAN communication signal (Low) (2)
| Channel | Probe | Terminal No. |
|---|---|---|
| 1 | + | L306-3 |
| – | L306-2 |
Measurement condition
Ignition: “ON”
