Pioneer MUH-GA20VB, MUH-GA35VB, MUH-GA25VB instruction

When OPERATION INDICATOR lamp flashes 0.5-second intervals or 1-time. Outdoor unit does not operate.

D How to check mis-wiring and serial signal error

Make them sure.

w1 Set the switch(SW2-2) on indoor electronic control P.C. board to MU or MUX type, when the outdoor unit is MU or MUX type.

If the setting is MUH or MXZ type, the unit does not work.

Start

w 2 Short circuit of JPG and JPS on the indoor electronic control P.C. board enables self-check to be displayed in 3 seconds.

Turn OFF the power supply(indoor/outdoor unit).

Set the switch(SW2-2) on the indoor electronic

Is the outdoor unit "MUH" type?

control P.C. board to MU or MUX type. w1

Yes

•Turn ON the power supply(indoor/outdoor unit).

Yes

•Press once EMERGENCY OPERATION switch.

Does the unit operate?

•3 min. later, check the self-check result

displayed on OPERATION INDICATOR

lamp on indoor unit. w 2

Refer to the

"Instruction of

troubleshooting."

Serial signal error is indicated.

Yes

(0.5-sec. ON, 0.5-sec. OFF)

Is this mis-wiring, poor contact,

or disconnection of wire?

1.Turn OFF the power supply(indoor/outdoor unit) and disconnect indoor and outdoor connecting wire on indoor side.

2.Short-circuit between indoor terminal block N and 3.

3.Turn ON the power supply(indoor unit) and press once EMERGENCY OPERATION switch.

Is there 20V DC between both ends of

R132 on indoor electronic control P.C. No board ?

( By tester, the stylus is between 0 ~ 20V. )

Yes

•Turn OFF the power supply(indoor unit). •Connect ON indoor and outdoor connecting wire.

Replace the indoor electronic control P.C. board.

Turn ON the power supply(outdoor unit).

Is there 230V AC between outdoor terminal		No	Check the outdoor power supply,
Is there 230V AC between outdoor terminal		No	power supply cord and
block L-N(TB1)?			power supply cord and
block L-N(TB1)?			connection.
	Yes

Is there 5V DC between J205 + –J101 - on the deicer P.C. board?

Yes

Turn ON the power supply(indoor unit).

Replace the deicer P.C. board.

During EMERGENCY OPERATION, is there 10V DC between both ends of R601?

(By tester, the stylus is between 5 ~10V)

Yes

	No	Make the wiring between CN730
	No	on the deicer P.C. board and
		on the deicer P.C. board and
		outdoor terminal block correct.

Replace the deicer P.C. board.

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

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.