TERMINALS OF ECU
CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
*A |
Main Body ECU (Multiplex Network Body ECU) with 1 Connector |
- |
- |
*A |
Main Body ECU (Multiplex Network Body ECU) with 2 Connectors |
- |
- |
(a) Disconnect the instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.
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(b) Reconnect the instrument panel junction block assembly connectors.
(c) Measure the resistance and voltage according to the value(s) in the table below.
HINT:
Measure the values on the wire harness side with the connector disconnected.
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
---|---|---|---|---|
MB-31 (BECU) - Body ground |
- |
Battery power supply |
Always |
11 to 14 V |
MB-32 (IG) - Body ground |
- |
Ignition power supply (IG signal) |
Ignition switch ON → off |
11 to 14 V → Below 1 V |
MB-30 (ACC) - Body ground |
- |
Ignition power supply (ACC signal) |
Ignition switch ACC → off |
11 to 14 V → Below 1 V |
MB-11 (GND1) - Body ground |
- |
Ground |
Always |
Below 1 Ω |
MB-2 (RCTY) - Body ground |
- |
Rear door courtesy light switch RH input |
Rear door LH closed (OFF) |
10 kΩ or higher |
Rear door LH open (ON) |
Below 1 Ω |
|||
MB-13 (LCTY) - Body ground |
- |
Rear door courtesy light switch LH input |
Rear door RH closed (OFF) |
10 kΩ or higher |
Rear door RH open (ON) |
Below 1 Ω |
CHECK COMBINATION METER ASSEMBLY
(a) Disconnect the F4 combination meter assembly connector.
(b) Measure the voltage and resistance according to the value(s) in the table below.
HINT:
Measure the values on the wire harness side with the connector disconnected.
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
---|---|---|---|---|
F4-40 (B) - Body ground |
SB - Body ground |
Battery power supply |
Always |
11 to 14 V |
F4-39 (IG+) - Body ground |
P - Body ground |
Ignition power supply |
Ignition switch off |
Below 1 V |
Ignition switch ON |
11 to 14 V |
|||
F4-21 (ET) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
F4-10 (MSD) - Body ground |
V - Body ground |
Rear LH seat belt buckle switch signal |
Rear LH seat belt fastened |
10 kΩ or higher |
Rear LH seat belt unfastened |
Below 1 Ω |
|||
F4-11 (MSTI) - Body ground |
BE - Body ground |
Rear center seat belt buckle switch signal |
Rear center seat belt fastened |
10 kΩ or higher |
Rear center seat belt unfastened |
Below 1 Ω |
|||
F4-13 (MSFM) - Body ground |
R - Body ground |
Rear RH seat belt buckle switch signal |
Rear RH seat belt fastened |
10 kΩ or higher |
Rear RH seat belt unfastened |
Below 1 Ω |
|||
F4-3 (RRMT) - Body ground |
W - Body ground |
Rear RH seat belt warning light signal |
Ignition switch ON, Rear RH seat belt unfastened within 34 seconds after closing rear door |
Below 1 V |
Ignition switch ON, Rear RH seat belt fastened within 34 seconds after closing rear door |
11 to 14 V |
|||
F4-2 (RCMT) - Body ground |
V - Body ground |
Rear center seat belt warning light signal |
Ignition switch ON, Rear center seat belt unfastened within 34 seconds after closing rear door |
Below 1 V |
Ignition switch ON, Rear center seat belt fastened within 34 seconds after closing rear door |
11 to 14 V |
|||
F4-1 (RLMT) - Body ground |
L - Body ground |
Rear LH seat belt warning light signal |
Ignition switch ON, Rear LH seat belt unfastened within 34 seconds after closing rear door |
Below 1 V |
Ignition switch ON, Rear LH seat belt fastened within 34 seconds after closing rear door |
11 to 14 V |
CHECK AIRBAG SENSOR ASSEMBLY
Terminal No. |
Terminal Symbol |
Destination |
---|---|---|
M1-10 |
LBE+ |
Front seat inner belt assembly LH |
M1-18 |
LBE- |
Front seat inner belt assembly LH |
CHECK OCCUPANT DETECTION ECU
(a) Measure the voltage and check for pulses according to the value(s) in the table below.
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
---|---|---|---|---|
Y6-10 (GND) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 V |
Y6-6 (IG2) - Y6-10 (GND) |
B - W-B |
Power source |
Ignition switch ON |
11 to 14 V |
Y6-9 (BGND) - Y6-10 (GND) |
P - W-B |
Front passenger buckle switch ground |
Always |
Below 1 V |
Y6-7 (BSW) - Y6-9 (BGND) |
G - P |
Front passenger buckle switch signal |
Always |
Pulse generation |
Y5-1 (SVC1) - Y5-5 (SGD1) |
R - G |
Front occupant classification sensor LH power supply |
Ignition switch ON |
11 to 14 V |
Y5-2 (SVC3) - Y5-6 (SGD3) |
GR - W |
Rear occupant classification sensor LH power supply |
Ignition switch ON |
11 to 14 V |
Y5-3 (SIG1) - Y5-5 (SGD1) |
P - G |
Front occupant classification sensor LH signal |
Ignition switch ON |
Pulse generation |
Y5-4 (SIG3) - Y5-6 (SGD3) |
SB - W |
Rear occupant classification sensor LH signal |
Ignition switch ON |
Pulse generation |
Y5-5 (SGD1) - Y6-10 (GND) |
G - W-B |
Front occupant classification sensor LH ground |
Always |
Below 1 V |
Y5-6 (SGD3) - Y6-10 (GND) |
W - W-B |
Rear occupant classification sensor LH ground |
Always |
Below 1 V |
Toyota CH-R Service Manual > Toyota Entune System: DCM Data Signal Circuit between Navigation ECU and DCM
DESCRIPTION
This circuit is used to send and receive signals between the DCM (Telematics
Transceiver) and radio and display receiver assembly.
WIRING DIAGRAM
PROCEDURE
1.
CHECK VEHICLE TYPE
(a) Check vehicle type.
Result
Proceed to
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Toyota CH-R Service Manual > Airbag System: Short in Front Passenger Side Squib Circuit (B1805/52-B1808/52)
DESCRIPTION
The front passenger side squib circuit consists of the airbag sensor assembly
and instrument panel passenger without door airbag assembly.
The airbag sensor assembly uses this circuit to deploy the airbag when deployment
conditions are met.
These DTCs are stored when a malfunction ...