Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

SYS.OK|MANUAL.DB● LIVE

HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 532 (HYBRID CONTROL SYSTEM - DIAGNOSIS)DTC P0A94/588: DC/DC CONVERTER PERFORMANCEINSPECTION PROCEDURE

2004 Toyota Matrix XR, FWD, Standard

Inspection Procedure

2004 Toyota Matrix XR, FWD, StandardSECTION Inspection Procedure

WARNING: This page is about a different car, the 2004 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION:

Before inspecting the high-voltage system, take safety precautions to prevent electrical shocks, such as wearing insulated gloves and removing the service plug grip. After removing the service plug grip, put it in your pocket to prevent other technicians from reconnecting it while you are servicing the high-voltage system.
After disconnecting the service plug grip, wait for at least 5 minutes before touching any of the high-voltage connectors or terminals.

HINT:

At least 5 minutes is required to discharge the high-voltage condenser inside the inverter.

CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU -INVERTER)

CAUTION: Wear insulated gloves before performing the following operation.

Turn the power switch OFF.
Remove the service plug grip (see SERVICE PLUG GRIP ).
NOTE: Turning the power switch ON (READY) with the service plug grip removed could cause malfunction. Therefore, never turn the power switch ON (READY) in this state.
Disconnect the H16 HV control ECU connector.
Remove the inverter cover (see W/CONVERTER INVERTER ASSY in HYBRID CONTROL SYSTEM ).
Disconnect the I10 inverter connector.
Turn the power switch ON (IG).
HINT:

DTCs for the interlock switch system are output when turning the power switch ON (IG) with both service plug grip and inverter cover removed.

Measure the voltage between the terminal of the HV control ECU connector and body ground.

Fig 1: Disconnecting H16 HV Control ECU Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard:

VOLTAGE CHECK

Tester Connection	Specified Condition
CPWM (H16-10) - Body ground	Below 1 V
GCNV (H16-8) - Body ground	Below 1 V

Turn the power switch OFF.

Check the resistance between the wire harness side connectors.

Standard (Check for open):

RESISTANCE CHECK

Tester Connection	Specified Condition
CPWM (H16-10) - CPWM (I10-13)	Below 1 Ω
GCNV (H16-8) - GCNV (I10-32)	Below 1 Ω

Standard (Check for short):

RESISTANCE CHECK

Tester Connection	Specified Condition
CPWM (H16-10) or CPWM (I10-13) - Body ground	10 kΩ or higher
GCNV (H16-8) or GCNV (I10-32) - Body ground	10 kΩ or higher

Fig 2: Reconnecting I10 Inverter Connector

Reconnect the inverter connector.
Reconnect the HV control ECU connector.
Reinstall the inverter cover (see W/CONVERTER INVERTER ASSY in HYBRID CONTROL SYSTEM ).
Reinstall the service plug grip (see SERVICE PLUG GRIP ).

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE W/CONVERTER INVERTER ASSY (See W/CONVERTER INVERTER ASSY in HYBRID CONTROL SYSTEM )

RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready Tools Free Quote Check Quote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.