Pioneer MUH-GA20VB, MUH-GA35VB, MUH-GA25VB service manual Instruction of troubleshooting

Models: MUH-GA20VB MUH-GA25VB MUH-GA35VB

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10-2. Instruction of troubleshooting

MUH-GA20VB - E1

MUH-GA25VB - E1

MUH-GA35VB - E1

Start

Indoor unit operates. Outdoor unit doesn't operate.

Indoor unit operates. Outdoor unit doesn't operate normally.

Indoor unit doesn't receive the signal from remote controller.

OPERATION INDICATOR lamp on the indoor unit is flashing on and off.

Outdoor unit

operates in

only Test Run

operation.

Check room

temperature

thermistor.

Refer to 10-5

"Test point

diagram and

voltage".

Outdoor unit doesn't operate even in Test Run operation.

Refer to 10-4.

A"Check of outdoor unit".

Outdoor unit doesn't stop even if indoor unit stops.

Refer to 10-4.

B"Check of outdoor unit".

Unit doesn't operate normal operation in COOL or HEAT mode.

Refer to 10-4.

C"Check of R.V. coil".

Indoor unit

Indoor unit

doesn't operate,

operates,

when the

when the

EMERGENCY

EMERGENCY

OPERATION

OPERATION

switch is

switch is

pressed.

pressed.

 

Refer to

1. Check indoor /

"Check of

outdoor

remote

connecting wire.

controller

2. Refer to

and receiver

"Check of indoor

P.C. board".

electronic control

 

P.C. board".

As for indoor unit MSC type, refer to service manual OB385 or OB393.

Flash on and off at 0.5-second intervals Cause: Indoor/Outdoor unit

Mis-wiring or trouble of serial signal

Refer to 10-4. D "How to check mis-wiring and serial signal error (When outdoor unit doesn't work)". W1

2-time flash Cause: Indoor unit

Trouble of room temp- erature/ indoor coil thermistor

Check room temperature thermistor and indoor coil thermis- tor.

Refer to 10-5 "Test point diagram and voltage".

3-time flash Cause: Indoor unit

Trouble of indoor fan motor

Refer to "Check of indoor fan motor".

4-time flash Cause: Indoor unit

Trouble of indoor unit control system

Replace the indoor electronic control P.C. board.

6-time flash Cause:

Outdoor unit

Trouble of thermistor in outdoor unit

Refer to 10-4. E"Check of outdoor thermistor".

7-time flash Cause:

Outdoor unit

Trouble of outdoor control system

Replace the deicer P.C. board.

W1.<The case of the trouble of the serial signal>

When the power is turned off and then turned on again, the indication shows “the trouble of mis-wiring”.

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Pioneer MUH-GA20VB, MUH-GA35VB, MUH-GA25VB service manual Instruction of troubleshooting

MUH-GA20VB, MUH-GA25VB, MUH-GA35VB specifications

The Pioneer MUH-GA25VB, MUH-GA35VB, and MUH-GA20VB are a trio of advanced multimedia head units designed to enhance the in-car experience with a blend of cutting-edge technology and user-friendly features. Each model offers a unique set of functionalities tailored to meet varying needs and preferences, while maintaining high standards in audio performance and connectivity.

The MUH-GA25VB serves as a versatile entry point into Pioneer’s lineup. It features a sleek 6.2-inch touchscreen display that provides intuitive controls and easy access to music and navigation. With Bluetooth connectivity, users can enjoy hands-free calling and wireless audio streaming, enhancing safety and convenience on the road. The built-in FM/AM tuner and compatibility with USB and AUX sources allow for diverse listening options. Moreover, the MUH-GA25VB supports various audio formats, ensuring playback flexibility.

Stepping up, the MUH-GA35VB incorporates enhanced sound tuning features, including a 13-band graphic equalizer that allows users to tailor audio output to their liking. The larger 7-inch touchscreen provides an immersive interface, making navigation through multimedia content seamless. This model also supports Apple CarPlay and Android Auto, enabling users to integrate their smartphones for a more connected experience. The voice control feature allows for hands-free operation of navigation and music, making it an ideal choice for tech-savvy drivers.

At the top of the range, the MUH-GA20VB boasts superior connectivity and sound quality. It is equipped with a high-resolution audio playback capability, supporting formats up to 192 kHz/24-bit for audiophiles seeking the best sound fidelity. With dual USB ports, users can connect multiple devices simultaneously, allowing for easier management of music and charging. The hardware enhancements include high-performance DACs that result in clearer and more detailed audio reproduction. Furthermore, this model features a customizable interface, enabling users to tailor the look of the head unit to match their vehicle’s interior.

Collectively, the Pioneer MUH series – MUH-GA25VB, MUH-GA35VB, and MUH-GA20VB – presents a compelling case for anyone looking to upgrade their vehicle’s audio and multimedia capabilities. They combine sophisticated technology with user-centric designs, ensuring a remarkable in-car experience that caters to a diverse range of audiophiles and tech enthusiasts alike. Whether you prioritize straightforward functionality or advanced features, there is a model in this lineup to suit every taste and requirement.