| Last Modified: 05-08-2025 | 6.11:8.1.0 | Doc ID: RM100000001OBBV |
| Model Year Start: 2020 | Model: RAV4 HV | Prod Date Range: [06/2020 - ] |
| Title: HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY): ECU Power Source Circuit; 2020 - 2025 MY RAV4 HV [06/2020 - ] | ||
|
ECU Power Source Circuit |
DESCRIPTION
If the ignition switch is ON, the hybrid vehicle control ECU assembly applies current to the MREL terminal to turn the IGCT relay on. This supplies power to the +B1 and +B2 terminals.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.
Click here
![2019 - 2025 MY RAV4 RAV4 HV [11/2018 - ]; INTRODUCTION: REPAIR INSTRUCTION: PRECAUTION](/t3Portal/stylegraphics/info.gif)
PROCEDURE
|
1. |
CHECK HYBRID VEHICLE CONTROL ECU ASSEMBLY (+B1, +B2 VOLTAGE) |
(a) Turn the ignition switch to ON.
(b) Measure the voltage according to the value(s) in the table below.
|
*a |
Component with harness connected (Hybrid Vehicle Control ECU Assembly) |
- |
- |
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A29-11 (+B1) - Body ground |
Ignition switch ON |
11 to 14 V |
|
A30-1 (+B2) - Body ground |
Ignition switch ON |
11 to 14 V |
(c) Turn the ignition switch off.
| NG |
|
|
|
2. |
CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - BODY GROUND) |
(a) Disconnect the A30 and A31 hybrid vehicle control ECU assembly connectors.
(b) Measure the resistance according to the value(s) in the table below.
|
*a |
Front view of wire harness connector (to Hybrid Vehicle Control ECU Assembly) |
- |
- |
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A30-3 (E1) - Body ground |
Always |
Below 1 Ω |
|
A31-12 (E01) - Body ground |
Always |
Below 1 Ω |
|
A31-11 (E02) - Body ground |
Always |
Below 1 Ω |
|
A31-34 (E12) - Body ground |
Always |
Below 1 Ω |
(c) Reconnect the A30 and A31 hybrid vehicle control ECU assembly connectors.
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
3. |
CHECK HYBRID VEHICLE CONTROL ECU ASSEMBLY (MREL VOLTAGE) |
(a) Turn the ignition switch to ON.
(b) Measure the voltage according to the value(s) in the table below.
|
*a |
Component with harness connected (Hybrid Vehicle Control ECU Assembly) |
- |
- |
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A29-5 (MREL) - Body ground |
Ignition switch ON |
11 to 14 V |
(c) Turn the Ignition switch off.
| NG |
|
REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY
|
|
|
4. |
CHECK FUSE (IGCT NO. 2) |
|
(a) Remove the IGCT NO. 2 fuse from the No. 3 relay block and junction block assembly. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
IGCT NO. 2 fuse terminals |
Always |
Below 1 Ω |
(c) Install the IGCT NO. 2 fuse.
| NG |
|
|
|
5. |
CHECK FUSE (IGCT) |
|
(a) Remove the IGCT fuse from the No. 3 relay block and junction block assembly. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
IGCT fuse terminals |
Always |
Below 1 Ω |
(c) Install the IGCT fuse.
| NG |
|
|
|
6. |
INSPECT RELAY (IGCT) |
|
(a) Remove the IGCT relay from the No. 3 relay block and junction block assembly. |
|
|
(b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
(c) Install the IGCT relay.
| NG |
|
REPLACE RELAY (IGCT) |
|
|
7. |
CHECK HARNESS AND CONNECTOR (NO. 3 RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY - HYBRID VEHICLE CONTROL ECU ASSEMBLY) |
(a) Disconnect the A29 and A30 hybrid vehicle control ECU assembly connectors.
(b) Remove the IGCT NO. 2 fuse from the No. 3 relay block and junction block assembly.
(c) Measure the resistance according to the value(s) in the table below.
|
*1 |
No. 3 Relay Block and Junction Block Assembly |
*2 |
IGCT NO. 2 Fuse |
|
*a |
Front view of wire harness connector (to Hybrid Vehicle Control ECU Assembly) |
- |
- |
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A29-11 (+B1) - 2 (IGCT NO. 2 fuse terminal) |
Always |
Below 1 Ω |
|
A30-1 (+B2) - 2 (IGCT NO. 2 fuse terminal) |
Always |
Below 1 Ω |
(d) Reconnect the A29 and A30 hybrid vehicle control ECU assembly connectors.
(e) Install the IGCT NO. 2 fuse.
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
8. |
CHECK HARNESS AND CONNECTOR (NO. 3 RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY) |
(a) Disconnect the IGCT fuse, IGCT NO. 2 fuse and IGCT relay from the No. 3 relay block and junction block assembly.
(b) Measure the resistance according to the value(s) in the table below.
|
*1 |
No. 3 Relay Block and Junction Block Assembly |
*2 |
IGCT NO. 2 Fuse |
|
*3 |
IGCT Relay |
*4 |
IGCT Fuse |
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
3 (IGCT relay) - 2 (IGCT fuse terminal) |
Always |
Below 1 Ω |
|
5 (IGCT relay) - 1 (IGCT NO. 2 fuse terminal) |
Always |
Below 1 Ω |
(c) Install the IGCT fuse, IGCT NO. 2 fuse and IGCT relay.
| NG |
|
REPLACE FUSE HOLDER |
|
|
9. |
CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - NO. 3 RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY) |
(a) Disconnect the A29 hybrid vehicle control ECU assembly connector.
(b) Remove the IGCT relay from the No. 3 relay block and junction block assembly.
(c) Measure the resistance according to the value(s) in the table below.
|
*1 |
No. 3 Relay Block and Junction Block Assembly |
*2 |
IGCT Relay |
|
*a |
Front view of wire harness connector (to Hybrid Vehicle Control ECU Assembly) |
- |
- |
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A29-5 (MREL) - 1 (IGCT relay) |
Always |
Below 1 Ω |
|
A29-5 (MREL) or 1 (IGCT relay) - Body ground and other terminals |
Always |
10 kΩ or higher |
(d) Install the IGCT relay.
(e) Reconnect the A29 hybrid vehicle control ECU assembly connector.
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
10. |
CHECK HARNESS AND CONNECTOR (NO. 3 RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY - BODY GROUND) |
(a) Remove the IGCT relay from the No. 3 relay block and junction block assembly
|
(b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
(c) Install the IGCT relay.
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
11. |
CHECK HARNESS AND CONNECTOR (NO. 3 RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY - HYBRID VEHICLE CONTROL ECU ASSEMBLY) |
(a) Remove the IGCT NO. 2 fuse from the No. 3 relay block and junction block assembly.
(b) Disconnect the A29 and A30 hybrid vehicle control ECU assembly connectors.
(c) Measure the resistance according to the value(s) in the table below.
|
*1 |
No. 3 Relay Block and Junction Block Assembly |
*2 |
IGCT No. 2 Fuse |
|
*a |
Front view of wire harness connector (to Hybrid Vehicle Control ECU Assembly) |
- |
- |
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A29-11 (+B1) or 2 (IGCT No. 2 fuse terminal) - Body ground and other terminals |
Always |
10 kΩ or higher |
|
A30-1 (+B2) or 2 (IGCT No. 2 fuse terminal) - Body ground and other terminals |
Always |
10 kΩ or higher |
(d) Reconnect the A29 and A30 hybrid vehicle control ECU assembly connectors.
(e) Install the IGCT No. 2 fuse.
| OK |
|
REPLACE FUSE (IGCT NO. 2) |
| NG |
|
|
12. |
CHECK HARNESS AND CONNECTOR (NO. 3 RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY) |
(a) Disconnect the IGCT fuse, IGCT NO. 2 fuse and IGCT relay from the No. 3 relay block and junction block assembly.
(b) Measure the resistance according to the value(s) in the table below.
|
*1 |
No. 3 Relay Block and Junction Block Assembly |
*2 |
IGCT NO. 2 Fuse |
|
*3 |
IGCT Relay |
*4 |
IGCT Fuse |
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
3 (IGCT relay) or 2 (IGCT fuse terminal) - Body ground and other terminals |
Always |
10 kΩ or higher |
|
5 (IGCT relay) or 1 (IGCT No. 2 fuse terminal) - Body ground and other terminals |
Always |
10 kΩ or higher |
(c) Install the IGCT fuse, IGCT NO. 2 fuse and IGCT relay.
| OK |
|
REPLACE FUSE (IGCT) |
| NG |
|
|
13. |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
| NEXT |
|
REPLACE FUSE (IGCT NO. 2) |
|
14. |
REPLACE FUSE HOLDER |
| NEXT |
|
REPLACE FUSE (IGCT) |
|
|