Terminals Of Ecu
- ARRANGEMENT OF MAYDAY ECU TERMINAL TERMINAL DESCRIPTION CHART
Symbols (Terminal No.) Wiring Color Terminal Description +B (R24-1) L Vehicle battery power supply SPO+ (R24-2) L Audio speaker output + SPO- (R24-3) LG Audio speaker output - TACC (R24-7) R Microphone power supply MCI+ (R24-8) Y Microphone input signal + MCI- (R24-9) BR Microphone input signal - SPI+ (R24-10) L Sound signal SPI- (R24-11) LG Sound signal E (R24-12) BR Ground IG2 (R24-13) GR IG power supply ACC (R24-14) LG ACC power supply GSW(R24-16) L Airbag signal MCO+ (R24-17) Y Microphone output MCO- (R24-18) BR Audio ground SG (R24-19) Shielded Shield ground HFOF (R24-21) BE Phone mute MUTE (R24-22) L Radio mute MPX1 (R24-23) L MPX line BBI+ (R23-2) B Mayday battery input IND1 (R23-4) LG Red LED output SIG1 (R23-5) P Mayday switch input BBI- (R23-9) W Mayday battery input IND2 (R23-11) L Green LED output SIG- (R23-12) G Mayday switch ground SIG2 (R23-13) BE Mayday switch input WFSE (R23-14) G DLC3 line SIL (R23-15) R DLC3 line - CHECK MAYDAY ECU
- Disconnect the R24 and R23 ECU connectors.
- Measure the resistance and voltage according to the value(s) in the table below.TERMINAL DESCRIPTION CHART
Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition R24-12 (E) - Body ground BR - Body ground Ground Always Below 1 Ω R24-1 (+B) - Body ground L - Body ground Vehicle battery power supply Always 11 to 14 V R24-14 (ACC) - Body ground LG - Body ground ACC power supply Engine switch on (ACC) 11 to 14 V R24-13 (IG2) - Body ground GR - Body ground IG power supply Engine switch on (IG) 11 to 14 V R24-10 (SPI+) - R24-12 (E) L - BR Sound signal Audio system is playing Waveform synchronized with sound is output R24-11 (SPI-) - R24-12 (E) LG - BR Sound signal Audio system is playing Waveform synchronized with sound is output R24-21 (HFOF) - R24-12 (E) O - BR Phone mute Engine switch on (IG) 3.3 to 5.0 V R24-22 (MUTE) - R24-12 (E) L - BR Radio mute Engine switch on (IG) Approx. 5 V R23-2 (BBI+) - R24-9 (BBI-) B - W Non-rechargeble back-up Always 9 to 16 V R23-4 (IND1) - R23-12 (SIG-) LG - G Red LED output Engine switch off Approx. 56 kΩ R23-5 (SIG1) - R23-12 (SIG-) P - G Mayday switch input Engine switch off, all buttons not pushed Approx. 4.7 kΩ R23-11 (IND2) - R23-12 (SIG-) L - G Green LED output Engine switch off Approx. 56 kΩ R23-13 (SIG2) - R23-12 (SIG-) BE - G Mayday switch input Engine switch off, all buttons not pushed Approx. 4.7 kΩ If the result is not as specified, there may be a malfunction on the wire harness side.
- Disconnect the B telephone antenna (cellular phone) connector (color: blue) from the ECU.
- Measure the resistance according to the value (s) in the table below.TERMINAL DESCRIPTION CHART
Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition B-1 (SIGNAL) - Body ground B - Body ground Telephone signal input/output Always Approx. 10 KΩ If the result is not as specified, there may be a malfunction on the antenna side.
- CHECK BUS BUFFER ECU
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
- Disconnect the L93 ECU connector.
- Measure the resistance and voltage according to the value(s) in the table below.TERMINAL DESCRIPTION CHART
Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition L93-4 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω L93-3 (+B) - Body ground R - Body ground Battery power supply Always 11 to 14 V If the result is not as specified, there may be a malfunction on the wire harness side.
- Reconnect the L93 ECU connector.
- Measure the voltage according to the value(s) in the table below.TERMINAL DESCRIPTION CHART
Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition L93-5 (S1) - L93-4 (GND) L - W-B MPX line Always Pulse generation If the result is not as specified, the ECU may have a malfunction.