ISMZ531 - Air conditioner PAC - Free user manual and instructions

Product Type	Auxiliary Audio Input Interface
Brand	PAC (iSimple)
Model (Vehicle-Specific Harness)	ISMZ531
Compatible Vehicles	Select Mazda models with factory SAT button (see manual for details)
Number of Auxiliary Inputs	2 (AUX1 and AUX2)
Input Connectors	RCA (female) and 3.5 mm stereo jack
Control Method	Factory radio buttons (SAT, CATEGORY UP/DOWN)
Power Source	Via factory radio harness (no external power required)
Installation Type	In-dash, behind factory radio
Dimensions (Approx.)	4 x 2 x 1 inches (10 x 5 x 2.5 cm)
Weight (Approx.)	0.2 lbs (90 g)
Operating Temperature	-20°C to 60°C
Storage Temperature	-30°C to 70°C
Warranty	1 year limited warranty
Safety Precautions	Disconnect vehicle battery before installation; keep cables away from moving parts
Included Accessories	Vehicle-specific harness (ISMZ531), PXAUX interface, RCA/3.5mm input cables (may vary)

Frequently Asked Questions - ISMZ531 PAC

How do I select AUX mode on a Mazda with the ISMZ531?

Press the SAT button to enter satellite radio mode, then press CATEGORY UP or CATEGORY DOWN to scroll through sources until AUX1 or AUX2 is displayed. If satellite radio is present, the AUX sources appear after the last satellite radio category.

How do I switch between AUX1 and AUX2?

Press the CATEGORY UP or CATEGORY DOWN button to scroll through available sources until the desired AUX input is displayed.

What audio sources can I connect?

You can connect any portable audio device with a 3.5mm headphone jack or RCA output, such as MP3 players, smartphones, or tablets.

Does the ISMZ531 require dipswitch settings?

No, dipswitch settings are only required for Toyota/Honda applications (ISTY531 and ISHD531). Mazda (ISMZ531) does not require any dipswitch adjustments.

What should I do if the radio displays 'DEV INIT'?

'DEV INIT' indicates the PXAUX is initializing. Wait one minute, then cycle the ignition off and on. After restart, access satellite radio mode again to begin normal operation.

What if I have no sound after installation?

First, verify that the auxiliary cable is securely connected to both the PXAUX and your audio device. Also check that the radio is in the correct AUX mode. If the problem persists, disconnect the 24-pin connector from the PXAUX for 5 minutes to reset the interface.

Is professional installation recommended?

Yes, for best performance and to avoid damage to your vehicle, professional installation is recommended. However, the manual provides detailed steps for DIY installation.

Will the ISMZ531 work with satellite radio?

Yes, the PXAUX integrates with the factory satellite radio system. AUX sources appear as additional categories in satellite radio mode.

Can I connect two devices at once?

Yes, the PXAUX provides two inputs: AUX1 (RCA) and AUX2 (3.5mm). You can connect two devices and switch between them using the radio controls.

What is the warranty period?

The PXAUX and harness come with a one-year limited warranty covering defects in material and workmanship. Proof of purchase from an authorized dealer is required.

USER MANUAL ISMZ531 PAC

Add Auxiliary Audio to Your Factory Radio

Owner's Manual PXAUX

Table of Contents

Pages

Introduction 4

Compatibility Notes 4

Dipswitch Settings 4

Installation 5

Ford/Lincoln/Mercury ISFD531 6

General Motors ISGM531 6

General Motors ISGM532/ISGM533 7

General Motors ISGM534 7

General Motors ISGM535 7

Honda ISHD531 8

Hyundai ISHY531/ISHY532 8

Mazda ISMZ531 8

Nissan ISNI531/ISNI532 8-9

Toyota ISTY531 9

Volkswagen ISVW532 10

Troubleshooting 10

Warranty Information 12

PXAUX & Optional Add-ons

Factory Radio (not included)

Close-up of a blue automotive electrical connector with black and blue plastic connectors, enclosed in an orange circle (no text or symbols visible)

Vehicle Specific Harness (actual harness may vary)

PXAUX Interface

Close-up of a black cable connector with two gold-colored connectors, enclosed in an orange circle (no text or symbols visible)

OR

Close-up of a black cable with red connectors and gold connectors, enclosed in an orange circle (no text or symbols visible)

OR

Close-up of a black audio jack with gold connector, enclosed in an orange circle (no text or symbols)

Close-up of a black electrical plug with a yellow connector, enclosed in an orange circle (no text or symbols visible)

RCA InputRCA Input
3.5mm Input3.5mm Input
Your Audio Devices

MP3 Player (not included)

Introduction

Thank you for purchasing the iSimple® PXAUX. The PXAUX is designed to provide endless hours of listening pleasure from your factory radio. To ensure that your auxiliary audio input performs correctly with your radio, we recommend that you read this entire manual before attempting installation of the PXAUX. This interface allows connectivity for two auxiliary audio inputs.

Compatibility Notes

Please visit www.isimplesolutions.com for the most up to date application information and to verify your vehicle's compatibility.

Dipswitch Settings

(ISTY531 & ISHD531 ONLY)

Application		Dipswitch 1	Dipswitch 2	Dipswitch 3	Dipswitch 4
Honda	All Vehicles with XM button	Of1	Off	Off	Off
	All vehicles without XM button	Of1	Off	OnOf	f
Lexus	2010+ Vehicles equipped with navigation	OnOffOffOff
	All Vehicles with AM-SAT button	OffOffOffOff
	All Vehicles without AM-SAT button	Of1	Off	OnOf	f
Scion	All Vehicles	Of1	Off	Off	Off
Toyota	2010-2011 Camry with AM-SAT button	OnOf	f	Off	Off
	2012+ vehicles equipped with non-navigation touchscreen radio	OnOffOffOff
	Vehicles equipped with navigation	OnOf	f	Off	Off
	All Other Vehicles with AM-Sat button	Of1	Off	Off	Off
	All other Vehicles Wwithout AM-Sat button	Of1	Off	OnOf	f

Installation

1. When making electrical connections it is always recommended that the vehicle's battery be disconnected from the electrical system before performing the installation.

Please Note: If the radio is equipped with a built in CD Changer, please remove ALL discs before proceeding to prevent damage to the radio's CD mechanism.

1. Carefully remove the trim panels covering the bolts that secure the radio into the dash cavity. Remove these bolts, and carefully pull the radio from the dash of the vehicle. This will provide access to the factory radio connectors where you will connect the vehicle specific harness.

2. Disconnect the factory harness (if present) from the back of the radio. If you are installing the PXAUX into a Toyota or Honda with an external CD Changer and you are using CD Changer emulation mode, the CD Changer will have to be disconnected at the changer location for proper operation.

3. Connect the 8-Pin auxiliary input cables to the ports on the PXAUX

4. Plug in the male connectors on the vehicle specific harness into the port on the back of the radio. Next, connect the factory harness (if present) into the female connector on the vehicle specific harness. Be sure to make a firm connection but do not force it. Plug the Black micro-fit 24-pin connector on the vehicle specific harness into the PXAUX.

5. To complete the installation secure the PXAUX into the cavity in the dash behind the radio. Be sure that the cables and interface modules are not near moving parts or sharp metal edges as they may damage the cables. To prevent rattling noises inside the dash, use zip ties, tape, or other fasteners to mount the interfaces securely.

6. With all connections made, reconnect the vehicle's battery, insert the key into the ignition, and turn the vehicle on. Check for proper operation of the PXAUX before reinstalling the factory dash panels.

7. Note: The first time you access the PXAUX, your radio may display "DEV INIT" while the device is initializing. If this is displayed, please wait one minute then cycle the ignition off and on. Then access PXAUX mode again to begin normal operation.

Ford/Lincoln/Mercury ISFD531 Operation

Selecting AUX:

Press the “AUX” or “SAT” button (SR123 icon on navigation radio) until “AUX1” is displayed on the screen. When you press the “AUX” button, you will see the corresponding “SAT” modes, a slight delay, and then the current mode will be displayed.

Selecting between AUX1 / AUX2

Press the “AUX” or “SAT” button (SR123 icon on navigation radio) until “AUX1” or “AUX2” is displayed on the screen.

General Motors ISGM531 Operation

Non Navigation

Selecting AUX

Press the “BAND” button a few times until “XM” is displayed on the screen. Immediately turn the rotary knob in the top right hand corner to scroll through available sources. Once “AUX1” is displayed, press the “FWD>>” button to select it. If you are currently in “SAT” mode you will need to press the “▶ I SEEK” button instead of “FWD>>” to select “AUX1” mode.

Selecting between AUX1 / AUX2

If you are currently in “AUX1” or “AUX2” mode turn the rotary knob to cycle through the available sources. Once “AUX1” or “AUX2” is displayed on the screen press the “FWD>>” button to select it.

Navigation radio operation

Selecting AUX

Press the “FM” button then press the “XM” button. Immediately turn the rotary tune knob in the top right hand corner to scroll through available sources. Once “AUX1” is displayed, press the “▶” button on the screen to select it. If you are currently in “SAT” mode, press the “SEEK ▶I” button instead of the “▶” button to select “AUX” mode.

Selecting between AUX1 / AUX2

If you are currently in “AUX1” or “AUX2” mode, turn the rotary knob to cycle through the available sources. Once “AUX1” or “AUX2” is displayed on the screen, press the “▶” button to select it..

General Motors ISGM532/ISGM533 Operation

Selecting AUX

Press the “BAND” button a few times until XM is displayed on the screen. Immediately turn the rotary knob to scroll through available sources. Once “AUX1” is displayed press PRESET 2 to select it.

Selecting between AUX1 / AUX2

If you are currently in “AUX1” or “AUX2” mode turn the rotary knob to cycle through the available sources. Once “AUX1” or “AUX 2” is displayed on the screen press PRESET 2 to select it.

General Motors ISGM534 Operation

Selecting AUX

Press the “AM/FM” button and then the “XM” button. Turn the rotary tune knob clockwise until “AUX1” is displayed. Press the “>>>>” button to select it. (It may be necessary to press the “CAT” button in order to make the “>>>>” button visible.)

Selecting between AUX1 / AUX2

Press the “AM/FM” button and then the “XM” button. Turn the rotary tune knob clockwise until “AUX2” is displayed. Press the “>>>>” button to select it. (It may be necessary to press the “CAT” button in order to make the “>>>>” button

General Motors ISGM535 Operation

Non Navigation

Selecting AUX

Press the “BAND” button until “XM” is displayed on the screen. Immediately turn the rotary knob to scroll through available sources. Once “AUX1” is displayed, press PRESET 6 to select it.

Selecting between AUX1 / AUX2

If you are currently in “AUX1” or “AUX2” mode turn the rotary knob to cycle through available sources. Once “AUX1” or “AUX2” is displayed on the screen press PRESET 6 to select it..

Honda/Acura ISHD531 Operation

Satellite Radio Mode

Selecting AUX

Press the "XM" button to switch to SAT. Immediately turn the rotary knob or press TUNE UP to scroll through available sources. Once "AUX1" is displayed, press PRESET 6 to select it.

Selecting between AUX1 / AUX2

Press the "XM" button to switch to SAT. Immediately turn the rotary knob or press TUNE UP to scroll through available sources. Once "AUX2" is displayed, press PRESET 6 to select it.

CD Changer Mode

Selecting AUX

Press the "DISC" or "AUX" button to switch to CD Changer mode. You are now in the AUX1 mode.

Selecting between AUX1 / AUX2

If you are currently in "AUX1" or "AUX2" mode press the "DISC ▲" button to cycle between AUX1" & "AUX 2". Disc up and down are Preset 5 & Preset 6

Hyundai ISHY531/ISHY532 Operation

Selecting AUX

Press the "XM" button to cycle through the PXAUX sources until "AUX1" or "AUX2" is displayed.

Selecting between AUX1 / AUX2

Press the "XM" button to cycle through the PXAUX sources until "AUX1" or "AUX2" is displayed.

Mazda ISMZ531 Operation

Selecting AUX

Press the “SAT” button to enter satellite radio mode. Press the “CATEGORY UP” or “CATEGORY DOWN” button to scroll through the available sources until “AUX 1” or “AUX 2” is displayed. If satellite radio is present, the PXAUX sources will show up AFTER the last satellite radio category.

Selecting between AUX1 / AUX2

Press the “CATEGORY UP” or “CATEGORY DOWN” button to scroll through the available sources until “AUX 1” or “AUX 2” is displayed.

Nissan ISNI531/ISNI532 Operation

Selecting AUX

Radios equipped with a "SAT" button

Press the “FM” button and then the “SAT” button. Immediately press the “SEEK>>” button to scroll through the available sources. Once “AUX1” is displayed, press the “<<TUNE” button to select it.

Radios equipped with a "RADIO" or "AM/FM/SAT" button

Press the “RADIO” or “AM/FM/SAT” button a few times until “SAT” is displayed. Immediately press the “SEEK ▲” button to scroll through the available sources. Once “AUX1” is displayed, press the “TUNE ▼” button to select it.

Selecting between AUX1 / AUX2

For radios that have a "SAT" button

Press the “FM” button and then the “SAT” button. Immediately press the “SEEK >>” button to scroll through the available sources. Once “AUX2” is displayed, press the “<<TUNE” button to select it.

For radios equipped with a "RADIO" or "AM/FM/SAT" button

Press the “Radio” or “AM/FM/SAT” button a few times until “SAT” is displayed. Immediately press the “SEEK▲” button to scroll through the available sources. Once “AUX2” is displayed, press the “TUNE ▼” button to select it.

Toyota/Scion/Lexus ISTY531 Operation

Satellite Radio Mode

Selecting AUX

Press the “AM/SAT” button to switch to AM then again to switch back to SAT. Immediately turn the rotary knob to scroll through available sources. Once “AUX1” is displayed, press PRESET 6 to select it.

Selecting between AUX1 / AUX2

If you are currently in “AUX1” or “AUX2” mode turn the rotary knob to cycle through the available sources. Once “AUX1” or “AUX2” is displayed on the screen press PRESET 6 to select it.

CD Changer Mode

Selecting AUX

Press the "DISC" or "AUX" button to switch to CD Changer mode. You are now in the AUX1 mode.

Selecting between AUX1 / AUX2

If you are currently in "AUX1" or "AUX2" mode press the "DISC ▲" button to cycle between AUX1" & "AUX 2".

Volkswagen ISVW532 Operation

Selecting AUX

Press the "CD" button twice to switch the radio to the CD Changer source. This will access "AUX1".

Selecting between AUX1 / AUX2

To select "AUX2" press preset #2. To select "AUX1" press preset #1.

Troubleshooting

Symptom Cause Remedy

Radio shows “DEV INIT”	PXAUX device is initializing.	This only occurs the first time the PXAUX is powered on. Wait a few minutes, cycle ignition off and on then enter SAT mode.
Radio does not recognize module.	Dipswitches are not set properly or the unit did not initialize properly.	See connection diagram for proper dipswitch setting. If the dipswitches are set properly disconnect the 24 pin micro-fit connector from the PXAUX for 5 minutes to reset the interface.
No sound. Auxiliary cable is not connected to accessory or PXAUX.		Verify that the auxiliary cable is connected to the PXAUX and the accessory.

Notes

Warranty Information

One Year Limited Warranty

The quality controls used in the manufacture of this product will ensure your satisfaction. This warranty applies only to the original purchaser of this product from an authorized iSimple® dealer. This warranty covers any supplied or manufactured parts of this product that, upon inspection by iSimple® authorized personnel, is found to have failed in normal use due to defects in material or workmanship. This warranty does not apply to installation expenses. Attempting to service or modify this unit, operating this unit under conditions other than the recommended voltage will render this WARRANTY VOID.

Unless otherwise prescribed by law, iSimple® shall not be liable for any personal injury, property damage and or any incidental or consequential damages of any kind (including water damage) resulting from malfunctions, defects, misuse, improper installation or alteration of this product. All parts of this iSimple® product are guaranteed for a period of 1 year as follows:

Within the first 12 months from date of purchase, subject to the conditions above, iSimple® will repair or replace the product at their discretion, if it is defective in material or workmanship providing it is returned to an Authorized iSimple® dealer, with PROOF OF PURCHASE from an authorized iSimple® dealer.

Warning:

This equipment may be reset by unintentional electrostatic discharge during operation. Exposure to direct sunlight or extreme heat may cause damage or malfunction.

For Best Performance Have It Professionally Installed.