Last Modified: 08-21-2023 6.11:8.1.0 Doc ID: RM100000001AU76
Model Year Start: 2019 Model: Avalon HV Prod Date Range: [04/2018 -           ]
Title: SUSPENSION CONTROL: ADAPTIVE VARIABLE SUSPENSION SYSTEM: C1782; Low Battery Positive Voltage; 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]

DTC

C1782

Low Battery Positive Voltage

DESCRIPTION

This DTC (C1782) is output if voltage matching the DTC detection condition continues to be supplied to the IGB terminal of the absorber control ECU due to malfunctions in the power source or charging circuits, such as the battery or generator assembly circuits.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

Memory

C1782

Low Battery Positive Voltage

While the engine switch is on (IG), the voltage at terminal IGB is 10 V or less, or 16 V or more for 0.5 seconds.
  • AVS fuse
  • IG1 NO. 3 relay
  • Battery
  • Charging system
  • Wire harness or connector
  • Absorber control ECU

Does not come on

No

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Before performing troubleshooting, inspect the connectors of related circuits.
  • Before replacing the absorber control ECU, perform all of the following:
    • Symptom simulation.

      Click here 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: HOW TO PROCEED WITH TROUBLESHOOTING

    • DTC inspection.

      Click here 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; SUSPENSION CONTROL: ADAPTIVE VARIABLE SUSPENSION SYSTEM: DTC CHECK / CLEAR

    • Techstream inspection.

      Click here 2019 MY Avalon Avalon HV [04/2018 - 08/2019]; SUSPENSION CONTROL: ADAPTIVE VARIABLE SUSPENSION SYSTEM: DATA LIST / ACTIVE TEST 2020 - 2022 MY Avalon Avalon HV [08/2019 -        ]; SUSPENSION CONTROL: ADAPTIVE VARIABLE SUSPENSION SYSTEM: DATA LIST / ACTIVE TEST

      • If no malfunctions are found in other areas, replace the absorber control ECU.
  • After replacing the absorber control ECU with a new one, perform registration of vehicle identification information.

    Click here 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; SUSPENSION CONTROL: ADAPTIVE VARIABLE SUSPENSION SYSTEM: TEST MODE PROCEDURE

  • Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.

READ VALUE USING TECHSTREAM (IG POWER SOURCE VOLTAGE)

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG).

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / Air suspension / Data List.

Chassis > Air suspension > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

IG Power Source Voltage

ECU power supply voltage

Min.: 0.0 V

Max.: 25.5 V

11 to 14 V (Actual ECU power supply voltage): Engine switch on (IG)

-

Chassis > Air suspension > Data List

Tester Display

IG Power Source Voltage

OK:

The value is as specified in the normal condition column.

NG

GO TO STEP 3

OK

2.

CHECK FOR DTCS

(a) Clear the DTCs.

Click here 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; SUSPENSION CONTROL: ADAPTIVE VARIABLE SUSPENSION SYSTEM: DTC CHECK / CLEAR

Chassis > Air suspension > Clear DTCs

(b) Turn the engine switch off.

(c) Check for DTCs.

Click here 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; SUSPENSION CONTROL: ADAPTIVE VARIABLE SUSPENSION SYSTEM: DTC CHECK / CLEAR

Chassis > Air suspension > Trouble Codes

Result

Proceed to

DTC is not output

A

DTC is output

B
A

USE SIMULATION METHOD TO CHECK

B

REPLACE ABSORBER CONTROL ECU 2019 - 2021 MY Avalon Avalon HV [04/2018 - 08/2021]; SUSPENSION CONTROL: SUSPENSION CONTROL ECU: REMOVAL 2022 MY Avalon Avalon HV [08/2021 -        ]; SUSPENSION CONTROL: SUSPENSION CONTROL ECU: REMOVAL

3.

INSPECT BATTERY

(a) Check the battery voltage.

Standard Voltage:

11 to 14 V

NG

CHECK OR REPLACE CHARGING SYSTEM OR BATTERY

OK

4.

INSPECT IG1 NO. 3 RELAY

(a) Turn the engine switch off.

(b) Inspect the IG1 NO. 3 relay.

Click here 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; SUSPENSION CONTROL: RELAY: ON-VEHICLE INSPECTION

NG

REPLACE IG1 NO. 3 RELAY
OK

5.

CHECK HARNESS AND CONNECTOR (POWER SOURCE - IG1 NO. 3 RELAY)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

1 (IG1 NO. 3 relay) - Body ground

Engine switch on (IG)

11 to 14 V

5 (IG1 NO. 3 relay) - Body ground

Always

11 to 14 V
NG

CHECK OR REPLACE CHARGING SYSTEM OR BATTERY

OK

6.

CHECK HARNESS AND CONNECTOR (IG1 NO. 3 RELAY - ABSORBER CONTROL ECU AND BODY GROUND)

(a) Disconnect the K59 absorber control ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

3 (IG1 NO. 3 relay) - K59-1 (IGB)

Always

Below 1 Ω

3 (IG1 NO. 3 relay) or K59-1 (IGB) - Body ground

Always

10 kΩ or higher

2 (IG1 NO. 3 relay) - Body ground

Always

Below 1 Ω
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

7.

CHECK HARNESS AND CONNECTOR (ABSORBER CONTROL ECU - BODY GROUND)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

K59-4 (GND) - Body ground

Always

Below 1 Ω
OK

REPLACE ABSORBER CONTROL ECU 2019 - 2021 MY Avalon Avalon HV [04/2018 - 08/2021]; SUSPENSION CONTROL: SUSPENSION CONTROL ECU: REMOVAL 2022 MY Avalon Avalon HV [08/2021 -        ]; SUSPENSION CONTROL: SUSPENSION CONTROL ECU: REMOVAL

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR