HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): Indicator Circuit; 2020 - 2022 MY Corolla Corolla HV [01/2019

Last Modified: 01-27-2025	6.11:8.1.0	Doc ID: RM100000001GCNC
Model Year Start: 2020	Model: Corolla	Prod Date Range: [01/2019 - 09/2022]
Title: HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): Indicator Circuit; 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]

Indicator Circuit

DESCRIPTION

In accordance with the shift lever position, each shift position indicator light will turn on.

WIRING DIAGRAM

PROCEDURE

1.	CHECK POSITION INDICATOR HOUSING ASSEMBLY (SHIFT POSITION INDICATOR)

(a) Turn the power switch on (ACC).

(b) Check that each shift position indicator light turns on correctly.

Result	Proceed to
All shift position indicator lights turn on simultaneously	A
Shift position indicator lights other than corresponding one turn on	B
Corresponding shift position indicator light does not turn on	C
No shift position indicator lights turn on	D

GO TO STEP 2

GO TO STEP 4

2.	CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT TO GND)

(a) Disconnect the I3 hybrid vehicle control ECU connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
I3-19 (INDP) - Body ground and other terminals	Always	10 kΩ or higher
I3-7 (INDR) - Body ground and other terminals	Always	10 kΩ or higher
I3-21 (INDN) - Body ground and other terminals	Always	10 kΩ or higher
I3-8 (INDD) - Body ground and other terminals	Always	10 kΩ or higher
I3-20 (INDB) - Body ground and other terminals	Always	10 kΩ or higher

*a	Front view of wire harness connector (to Hybrid Vehicle Control ECU)

REPLACE HYBRID VEHICLE CONTROL ECU

3.	CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - SHIFT POSITION INDICATOR (POSITION INDICATOR HOUSING ASSEMBLY))

(a) Disconnect the I3 hybrid vehicle control ECU connector.

(b) Disconnect the I39 shift position indicator (position indicator housing assembly) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
I3-19 (INDP) or I39-10 (P) - Body ground and other terminals	Always	10 kΩ or higher
I3-7 (INDR) or I39-9 (R) - Body ground and other terminals	Always	10 kΩ or higher
I3-21 (INDN) or I39-8 (N) - Body ground and other terminals	Always	10 kΩ or higher
I3-8 (INDD) or I39-7 (D) - Body ground and other terminals	Always	10 kΩ or higher
I3-20 (INDB) or I39-6 (B) - Body ground and other terminals	Always	10 kΩ or higher

Front view of wire harness connector

(to Hybrid Vehicle Control ECU)

Front view of wire harness connector

(to Shift Position Indicator (Position Indicator Housing Assembly))

(d) Reconnect the I39 shift position indicator (position indicator housing assembly) connector.

(e) Reconnect the I3 hybrid vehicle control ECU connector.

REPLACE POSITION INDICATOR HOUSING ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

(a) Disconnect the I39 shift position indicator connector.

(b) Turn the power switch on (ACC).

Standard Voltage:

Tester Connection	Condition	Specified Condition
I39-1 (PWR) - Body ground	Power switch on (ACC)	11 to 14 V

*a	Front view of wire harness connector (to Shift Position Indicator (Position Indicator Housing Assembly))

(d) Turn the power switch off.

(e) Reconnect the I39 shift position indicator connector.

REPAIR OR REPLACE POWER SOURCE CIRCUIT

5.	CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL ACCI)

(a) Turn the power switch on (ACC).

(b) Measure the voltage according to the value(s) in the table below.

Component with harness connected

(Hybrid Vehicle Control ECU)

Standard Voltage:

Tester Connection	Condition	Specified Condition
I2-29 (ACCI) - Body ground	Power switch on (ACC)	11 to 14 V

REPAIR OR REPLACE POWER SOURCE CIRCUIT

6.	CHECK HARNESS AND CONNECTOR (CHECK FOR OPEN)

(a) Disconnect the I3 hybrid vehicle control ECU connector.

(b) Turn the power switch on (ACC).

Standard Voltage:

Tester Connection	Condition	Specified Condition
I3-19 (INDP) - Body ground and other terminals	Power switch on (ACC)	11 to 14 V
I3-7 (INDR) - Body ground and other terminals	Power switch on (ACC)	11 to 14 V
I3-21 (INDN) - Body ground and other terminals	Power switch on (ACC)	11 to 14 V
I3-8 (INDD) - Body ground and other terminals	Power switch on (ACC)	11 to 14 V
I3-20 (INDB) - Body ground and other terminals	Power switch on (ACC)	11 to 14 V

*a	Front view of wire harness connector (to Hybrid Vehicle Control ECU)

(d) Turn the power switch off.

(e) Reconnect the I3 hybrid vehicle control ECU connector.

REPLACE HYBRID VEHICLE CONTROL ECU

7.	CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - SHIFT POSITION INDICATOR (POSITION INDICATOR HOUSING ASSEMBLY))

(a) Disconnect the I3 hybrid vehicle control ECU connector.

(b) Disconnect the I39 shift position indicator connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
I3-19 (INDP) - I39-10 (P)	Always	Below 1 Ω
I3-7 (INDR) - I39-9 (R)	Always	Below 1 Ω
I3-21 (INDN) - I39-8 (N)	Always	Below 1 Ω
I3-8 (INDD) - I39-7 (D)	Always	Below 1 Ω
I3-20 (INDB) - I39-6 (B)	Always	Below 1 Ω

Front view of wire harness connector

(to Hybrid Vehicle Control ECU)

Front view of wire harness connector

(to Shift Position Indicator (Position Indicator Housing Assembly))

(d) Reconnect the I39 shift position indicator connector.

(e) Reconnect the I3 hybrid vehicle control ECU connector.

REPLACE POSITION INDICATOR HOUSING ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR