April 5, 2026: LEMON Manuals is launched! Read the announcement.

Signal Specification, CARPHONE

General

All the values given below are between the respective connection in column 1 and connection #A6 in column 2 (power ground) unless otherwise stated in brackets.

NOTE:

It is important to connect the breakout box and check the ground terminals before taking readings.

For information on:

Connecting the breakout box, see CONNECTING THE BREAKOUT BOX TO THE CARPHONE MODULE .
Checking ground connection, see CHECKING VOLTAGE / GROUND CONNECTION, MEDIA/INFOTAINMENT .

There may be several connections and connectors between control modules and components.

U=	DC voltage in volts (V)	U_AC =	AC voltage in volts (V)
U_bat =	Battery voltage (V)	f =	Frequency in Hertz (Hz)
U_low =	Voltage approx. 0 V	t =	Time in s (seconds)
PWM =	Pulse-width modulated signal in %

Fig 1: Identifying Connector (F) Terminals

GLL104034

Courtesy of VOLVO CARS CORPORATION

SIGNAL TABLE CONNECTOR A, PHONE MODULE (PHM)

Connection breakout box	Connection control module	Signal type	Ignition on	Idle	Other
#1	#A1	-	-	-	-
#2	#A2	-	-	-	-
#3	#A3	-	-	-	-
#4	#A4	-	-	-	-
#5	#A5	+30-feed	U_bat	U_bat	-
#6	#A6	Power ground	U_low	U_low	-
#7	#A7	Handset, voltage feed	U_bat	U_bat	-
#8	#A8	Handset, cradle signal	U=5 V when handset is used, otherwise U=0 V.	U=5 V when handset is used, otherwise U=0 V.	-
#9	#A9	-	-	-	-
#10	#A10	-	-	-	-
#11	#A11	CAN (L)	Digital signal	Digital signal	-
#12	#A12	CAN (H)	Digital signal	Digital signal	-
#13	#A13	-	-	-	-l
#14	#A14	-	-	-	-
#15	#A15	-	-	-	-
#16	#A16	-	-	-	-
#17	#A17	Impact cable from SRS	U=12 V at activated SRS-component, otherwise U=0 V	U=12 V at activated SRS-component, otherwise U=0 V	-
#18	#A18	Handset, ground	U_low	U_low	-
#19	#A19	Handset, microphone	Alternating voltage at sound in microphone	Alternating voltage at sound in microphone	Difficult to measure
#20	#A20	Handset, speaker	Alternating voltage at sound in speaker	Alternating voltage at sound in speaker	Difficult to measure
#21	#A21	-	-	-	-
#22	#A22	-	-	-	-

Fig 2: Identifying Signal Table Connector B, Phone Module (PHM)

GLL101505

Courtesy of VOLVO CARS CORPORATION

SIGNAL TABLE CONNECTOR B, PHONE MODULE (PHM)

Connection breakout box	Connection control module	Signal type	Ignition on	Idle	Other
#21	#B1	Clock signal to SIM-card	Pound signal	Pound signal	-
#22	#B2	Signal ground, SIM-card	U_low	U_low	-
#23	#B3	Voltage feed, SIM-card	U=2.8 V	U=2.8 V	-
#24	#B4	Communication cable, SIM-card	Pulsed signal	Pulsed signal	-
#25	#B5	Control signal, SIM-card	Pulsed signal	Pulsed signal	-
#26	#B6	Diagnostic cable, SIM-card	U_low	U_low	-

Fig 3: Identifying 1-Bit Connector

GLL139873

Courtesy of VOLVO CARS CORPORATION

SIGNAL TABLE CONNECTOR C, PHONE MODULE (PHM)

Connection breakout box	Connection control module	Signal type	Ignition on	Idle	Other
-	#C1	Telephone antenna	Antenna signal telephone	Antenna signal telephone	-
-	#C2	Antenna ground	U_low	U_low	-

Fig 4: Identifying Connector C

GLL108086

Courtesy of VOLVO CARS CORPORATION

SIGNAL TABLE CONNECTOR D, PHONE MODULE (PHM)

Connection breakout box	Connection control module	Signal type	Ignition on	Idle	Other
-	#D1	MOST input signal	Optical input signal when the MOST network is activated	Optical input signal when the MOST network is activated	-
-	#D2	MOST output signal	Optical output signal when the MOST network is activated	Optical output signal when the MOST network is activated	-

Fig 5: Identifying Signal Table Connector B, Phone Module (PHM)

GLL101505

Courtesy of VOLVO CARS CORPORATION

SIGNAL TABLE CONNECTOR SIM-CARD HOLDER

Connection breakout box	Connection control module	Signal type	Ignition on	Idle	Other
#21	#1	Clock signal to SIM-card	Pound signal	Pound signal	-
#22	#2	Signal ground, SIM-card	U_low	U_low	-
#23	#3	Voltage feed, SIM-card	U=2.8 V	U=2.8 V	-
#24	#4	Communication cable, SIM-card	Pulsed signal	Pulsed signal	-
#25	#5	Control signal, SIM-card	Pulsed signal	Pulsed signal	-
#26	#6	Diagnostic cable, SIM-card	U_low	U_low	-

Fig 6: 10 CD Changer Connector Terminals

GLL104029

Courtesy of VOLVO CARS CORPORATION

SIGNAL TABLE CONNECTOR HANDSET

Connection breakout box	Connection control module	Signal type	Ignition on	Idle	Other
#21	#1	Handset, microphone	Alternating voltage at sound in microphone	Alternating voltage at sound in microphone	Difficult to measure
#22	#2	Handset, speaker	Alternating voltage at sound in microphone	Alternating voltage at sound in microphone	Difficult to measure
#23	#3	Handset, ground	U_low	U_low	-
#24	#4	Handset, cradle signal	U=5 V when handset is used, otherwise U=0 V.	U=5 V when handset is used, otherwise U=0 V.	-
#25	#5	Handset, voltage feed	U_bat	U_bat	-