| Last Modified: 07-31-2024 | 6.11:8.1.0 | Doc ID: RM100000001H6HU |
| Model Year Start: 2020 | Model: Corolla | Prod Date Range: [01/2019 - 06/2021] |
| Title: NETWORKING: LIN COMMUNICATION SYSTEM (for HV Model): TERMINALS OF ECU; 2020 - 2021 MY Corolla Corolla HV [01/2019 - 06/2021] | ||
TERMINALS OF ECU
CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
(a) Disconnect the MB main body ECU (multiplex network body ECU) connector.
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![2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL](/t3Portal/stylegraphics/info.gif)
(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 connectors disconnected.
|
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
MB-11 (GND1) - Body ground |
- |
Ground |
Always |
Below 1 Ω |
|
MB-31 (BECU) - Body ground |
- |
Auxiliary battery power supply |
Power switch off |
11 to 14 V |
|
MB-30 (ACC) - Body ground |
- |
ACC power supply |
Power switch on (ACC) |
11 to 14 V |
|
Power switch off |
Below 1 V |
|||
|
MB-32 (IG) - Body ground |
- |
IG power supply |
Power switch on (IG) |
11 to 14 V |
|
Power switch off |
Below 1 V |
(c) Reconnect the MB main body ECU (multiplex network body ECU) connector.
(d) Check for pulses according to the value(s) in the table below.
|
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
4A-25 - Body ground |
GR - Body ground |
LIN communication line |
Power switch on (IG) |
Pulse generation |
CHECK POWER WINDOW REGULATOR MOTOR ASSEMBLY (DRIVER DOOR)
(a) Disconnect the L2 power window regulator motor assembly (driver door) 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 |
|---|---|---|---|---|
|
L2-2 (B) - Body ground |
L - Body ground |
Auxiliary battery power supply |
Power switch off |
11 to 14 V |
|
L2-1 (GND) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
(c) Reconnect the L2 power window regulator motor assembly (driver door) connector.
(d) Check for pulses according to the value(s) in the table below.
|
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
L2-9 (LIN) - Body ground |
W - Body ground |
LIN communication line |
Power switch on (IG) |
Pulse generation |
CHECK POWER WINDOW REGULATOR MOTOR ASSEMBLY (FRONT PASSENGER DOOR)
(a) Disconnect the K2 power window regulator motor assembly (front passenger door) 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 |
|---|---|---|---|---|
|
K2-2 (B) - Body ground |
LA-L - Body ground |
Auxiliary battery power supply |
Power switch off |
11 to 14 V |
|
K2-1 (GND) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
(c) Reconnect the K2 power window regulator motor assembly (front passenger door) connector.
(d) Check for pulses according to the value(s) in the table below.
|
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
K2-9 (LIN) - Body ground |
W - Body ground |
LIN communication line |
Power switch on (IG) |
Pulse generation |
CHECK POWER WINDOW REGULATOR MOTOR ASSEMBLY (REAR RH DOOR)
(a) Disconnect the M2 power window regulator motor assembly (rear RH door) 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 |
|---|---|---|---|---|
|
M2-2 (B) - Body ground |
LA-R - Body ground |
Auxiliary battery power supply |
Power switch off |
11 to 14 V |
|
M2-1 (GND) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
(c) Reconnect the M2 power window regulator motor assembly (rear RH door) connector.
(d) Check for pulses according to the value(s) in the table below.
|
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
M2-9 (LIN) - Body ground |
LG - Body ground |
LIN communication line |
Power switch on (IG) |
Pulse generation |
CHECK POWER WINDOW REGULATOR MOTOR ASSEMBLY (REAR LH DOOR)
(a) Disconnect the N2 power window regulator motor assembly (rear LH door) 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 |
|---|---|---|---|---|
|
N2-2 (B) - Body ground |
LA-R - Body ground |
Auxiliary battery power supply |
Power switch off |
11 to 14 V |
|
N2-1 (GND) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
(c) Reconnect the N2 power window regulator motor assembly (rear LH door) connector.
(d) Check for pulses according to the value(s) in the table below.
|
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
N2-9 (LIN) - Body ground |
LG - Body ground |
LIN communication line |
Power switch on (IG) |
Pulse generation |
CHECK MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY
(a) Disconnect the L7 multiplex network master switch 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 |
|---|---|---|---|---|
|
L7-11 (B) - Body ground |
B - Body ground |
Auxiliary battery power supply |
Power switch off |
11 to 14 V |
|
L7-12 (GND) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
(c) Reconnect the L7 multiplex network master switch assembly connector.
(d) Check for pulses according to the value(s) in the table below.
|
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
L7-17 (LIN1) - Body ground |
LG - Body ground |
LIN communication line |
Power switch on (IG) |
Pulse generation |
|
L7-16 (LIN2) - Body ground |
W - Body ground |
LIN communication line |
Power switch on (IG) |
Pulse generation |
CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
(a) Disconnect the I1 certification ECU (smart key ECU 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 |
|---|---|---|---|---|
|
I1-3 (+B) - Body ground |
GR - Body ground |
Auxiliary battery power supply |
Power switch off |
11 to 14 V |
|
I1-18 (E) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
(c) Reconnect the I1 certification ECU (smart key ECU assembly) connector.
(d) Check for pulses according to the value(s) in the table below.
|
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
I1-14 (LIN) - Body ground |
V - Body ground |
LIN communication line |
Power switch on (IG) |
Pulse generation |
CHECK STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY)
(a) Disconnect the I59 steering lock ECU (steering lock actuator or upper bracket assembly) connector.
(b) Measure the voltage and resistance according to the value(s) in the table below.
|
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
I59-7 (B) - Body ground |
L - Body ground |
Auxiliary battery power supply |
Power switch off |
11 to 14 V |
|
I59-1 (GND) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
(c) Reconnect the I59 steering lock ECU (steering lock actuator or upper bracket assembly) connector.
(d) Check for pulses according to the value(s) in the table below.
|
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
I59-5 (LIN) - Body ground |
G - Body ground |
LIN communication line |
Power switch on (IG) |
Pulse generation |
CHECK ID CODE BOX (IMMOBILISER CODE ECU)
(a) Disconnect the I20 ID code box (immobiliser code ECU) 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 |
|---|---|---|---|---|
|
I20-5 (GND) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
|
I20-1 (+B) - Body ground |
L - Body ground |
+B power supply |
Power switch off |
11 to 14 V |
(c) Reconnect the I20 ID code box (immobiliser code ECU) connector.
(d) Check for pulses according to the value(s) in the table below.
|
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
I20-2 (LIN1) - Body ground |
P - Body ground |
LIN communication line |
Power switch on (IG) |
Pulse generation |
|
|