2012 Radio Does not work - Nav screen does
Thread Starter
8th Gear
Joined: Oct 2021
Posts: 8
Likes: 0
From: MA
2012 Radio Does not work - Nav screen does
Hello all
My 2012 CT200h with Navigation has a radio issue. I've replaced it three times, but still no dice. Here are the symptoms:
What works
-The navigation screen flips up and stays on the map view when the car is on
-Back up camera works
-Mouse centers when the car is turned on or off
-Radio lights work and dim accordingly
-USB does charge my phone, but painfully slow (1% per 10 min). My phone does stop playing audio aloud when its plugged in, suggesting the USB port does behave like a receiver
-When I press the phone call buttons on the steering wheel the nav screen switches to a call screen with a num pad.
-Pressing and holding the SOS button on the ceiling the warning comes on that my subscription is up. This is the only noise the speakers have made.
What doesnt work
-Anything that a standard radio would do
-Anything in the infotainment center
-Mouse
-The whole system is effectively dead besides the back up cam and nav screen
What I've tried
-Checked, sanded, and ran continuity tests on the following fuses:
-Tapped each speaker from the amp connections with a 9 v battery, all made noises.
-Checked to make sure the amp has sufficient power and ground. (note they were 14V+ while the car was running and only 12V+ when turned off)
-Replaced the radio headunit with three different used ones that supposedly worked
-Pressed and held the power button for 15 seconds
-disconnected the 12V battery for 20 min
-Recently (~July 2022) ran a load test on the 12V battery. Load test nearly failed. Battery will be replaced soon.
Impedance and Voltage Checks
H57 Connector at Amplifier:
Rear Left Door (Pin 4 to 11): 3.2 ohm
Rear Right Door (Pin 5 to 12): 3 ohm
Front Right Door (Pin 9 to 10): 3 ohm
Front Left Door (Pin 3 to 8): 3.2 ohm
H58 Connector at Amplifier:
Woofer (Pin 1 to 2): 1.4 ohm
Front Left Dash (Pin 3 to 9): 3.3 ohm
Front Right Dash (Pin 4 to 10): 3.7 ohm
Front Center Dash (Pin 8 to 7): 3.4 ohm
H56 Connector at Amplifier: (Checked for voltage using pin 5 'Body Ground')
Vehicle Speed Signal (Pin 2): 14.3V
MOST Communication Wake-up Signal (Pin 3): 14.7V
MOST Communication Signal (Pin 4): 0
MOST Communication Signal (Pin 6): 0
MOST Communication Wake-up Signal (Pin 9): 0
MOST Communication Signal (Pin 10): 0
MOST Communication Signal (Pin 12): 0
H59 Connector at Amplifier:
Power Source (Pin 1 to 2): 14.9V when car is running, ~12V when car is off
Power Source (Pin 3 to 6): 14.9V when car is running, ~12V when car is off
Connectors at radio:
I lost the specific voltage readings, but the head unit had power and ignition.
Additional Information
-The used radios I installed did not work, however I could hear noises coming from the disk changer for a couple of seconds when the car was turned on or after replacing the fuse.
-I bought the car like this, never heard the speakers work.
-The faceplate number is P10041
My plan
-Cry
-bench test spare radios
-replace the 12V battery
-replace the under seat amplifier
If anyone can help or has information please share!
My 2012 CT200h with Navigation has a radio issue. I've replaced it three times, but still no dice. Here are the symptoms:
What works
-The navigation screen flips up and stays on the map view when the car is on
-Back up camera works
-Mouse centers when the car is turned on or off
-Radio lights work and dim accordingly
-USB does charge my phone, but painfully slow (1% per 10 min). My phone does stop playing audio aloud when its plugged in, suggesting the USB port does behave like a receiver
-When I press the phone call buttons on the steering wheel the nav screen switches to a call screen with a num pad.
-Pressing and holding the SOS button on the ceiling the warning comes on that my subscription is up. This is the only noise the speakers have made.
What doesnt work
-Anything that a standard radio would do
-Anything in the infotainment center
-Mouse
-The whole system is effectively dead besides the back up cam and nav screen
What I've tried
-Checked, sanded, and ran continuity tests on the following fuses:
- Rad 1 under the hood
- S Horn under the hood
- Amp 1 and 2 under the hood
- Rad 2 under dash
- Panels under dash
- Meters under dash
- Power Outlet under dash
-Tapped each speaker from the amp connections with a 9 v battery, all made noises.
-Checked to make sure the amp has sufficient power and ground. (note they were 14V+ while the car was running and only 12V+ when turned off)
-Replaced the radio headunit with three different used ones that supposedly worked
-Pressed and held the power button for 15 seconds
-disconnected the 12V battery for 20 min
-Recently (~July 2022) ran a load test on the 12V battery. Load test nearly failed. Battery will be replaced soon.
Impedance and Voltage Checks
H57 Connector at Amplifier:
Rear Left Door (Pin 4 to 11): 3.2 ohm
Rear Right Door (Pin 5 to 12): 3 ohm
Front Right Door (Pin 9 to 10): 3 ohm
Front Left Door (Pin 3 to 8): 3.2 ohm
H58 Connector at Amplifier:
Woofer (Pin 1 to 2): 1.4 ohm
Front Left Dash (Pin 3 to 9): 3.3 ohm
Front Right Dash (Pin 4 to 10): 3.7 ohm
Front Center Dash (Pin 8 to 7): 3.4 ohm
H56 Connector at Amplifier: (Checked for voltage using pin 5 'Body Ground')
Vehicle Speed Signal (Pin 2): 14.3V
MOST Communication Wake-up Signal (Pin 3): 14.7V
MOST Communication Signal (Pin 4): 0
MOST Communication Signal (Pin 6): 0
MOST Communication Wake-up Signal (Pin 9): 0
MOST Communication Signal (Pin 10): 0
MOST Communication Signal (Pin 12): 0
H59 Connector at Amplifier:
Power Source (Pin 1 to 2): 14.9V when car is running, ~12V when car is off
Power Source (Pin 3 to 6): 14.9V when car is running, ~12V when car is off
Connectors at radio:
I lost the specific voltage readings, but the head unit had power and ignition.
Additional Information
-The used radios I installed did not work, however I could hear noises coming from the disk changer for a couple of seconds when the car was turned on or after replacing the fuse.
-I bought the car like this, never heard the speakers work.
-The faceplate number is P10041
My plan
-Cry
-bench test spare radios
-replace the 12V battery
-replace the under seat amplifier
If anyone can help or has information please share!
Last edited by BuildaCT; Jul 13, 2022 at 06:43 AM. Reason: updated information
Thread Starter
8th Gear
Joined: Oct 2021
Posts: 8
Likes: 0
From: MA
I think my problem may be similar to the unanswered CT200hforum thread here: 2012 CT200h w/ nav - AMP reprogramming?
I will reach out to the poster. After digging around other Lexus forums, it may be possible the head unit is going into a protection mode, which would fit with the units only making sounds from the CD player when newly installed. Does this make sense?
I will reach out to the poster. After digging around other Lexus forums, it may be possible the head unit is going into a protection mode, which would fit with the units only making sounds from the CD player when newly installed. Does this make sense?
Driver School Candidate
Joined: Mar 2022
Posts: 1
Likes: 0
From: GA
I think my problem may be similar to the unanswered CT200hforum thread here: 2012 CT200h w/ nav - AMP reprogramming?
I will reach out to the poster. After digging around other Lexus forums, it may be possible the head unit is going into a protection mode, which would fit with the units only making sounds from the CD player when newly installed. Does this make sense?
I will reach out to the poster. After digging around other Lexus forums, it may be possible the head unit is going into a protection mode, which would fit with the units only making sounds from the CD player when newly installed. Does this make sense?
Thread Starter
8th Gear
Joined: Oct 2021
Posts: 8
Likes: 0
From: MA
Nothing. I haven't worked on it since the post was last updated because of the cold. I have another used radio to try throwing in there. we have a couple of warm days coming up so I may try it. fingers crossed but I doubt
Thread Starter
8th Gear
Joined: Oct 2021
Posts: 8
Likes: 0
From: MA
Updated original post to include:
-Voltage checks at back of head unit connectors
-12V battery nearly failed load test. Will be replaced later today.
As other users have suggested I may try to find a used amplifier to throw in there. I am hesitant to suspect the amplifier because the SOS button works.
-Voltage checks at back of head unit connectors
-12V battery nearly failed load test. Will be replaced later today.
As other users have suggested I may try to find a used amplifier to throw in there. I am hesitant to suspect the amplifier because the SOS button works.
1st Gear
Joined: Feb 2023
Posts: 1
Likes: 0
From: Auckland
Did anyone find a solution for this? I have the same issue with no resolution
Hello all
My 2012 CT200h with Navigation has a radio issue. I've replaced it three times, but still no dice. Here are the symptoms:
What works
-The navigation screen flips up and stays on the map view when the car is on
-Back up camera works
-Mouse centers when the car is turned on or off
-Radio lights work and dim accordingly
-USB does charge my phone, but painfully slow (1% per 10 min). My phone does stop playing audio aloud when its plugged in, suggesting the USB port does behave like a receiver
-When I press the phone call buttons on the steering wheel the nav screen switches to a call screen with a num pad.
-Pressing and holding the SOS button on the ceiling the warning comes on that my subscription is up. This is the only noise the speakers have made.
What doesnt work
-Anything that a standard radio would do
-Anything in the infotainment center
-Mouse
-The whole system is effectively dead besides the back up cam and nav screen
What I've tried
-Checked, sanded, and ran continuity tests on the following fuses:
-Tapped each speaker from the amp connections with a 9 v battery, all made noises.
-Checked to make sure the amp has sufficient power and ground. (note they were 14V+ while the car was running and only 12V+ when turned off)
-Replaced the radio headunit with three different used ones that supposedly worked
-Pressed and held the power button for 15 seconds
-disconnected the 12V battery for 20 min
-Recently (~July 2022) ran a load test on the 12V battery. Load test nearly failed. Battery will be replaced soon.
Impedance and Voltage Checks
H57 Connector at Amplifier:
Rear Left Door (Pin 4 to 11): 3.2 ohm
Rear Right Door (Pin 5 to 12): 3 ohm
Front Right Door (Pin 9 to 10): 3 ohm
Front Left Door (Pin 3 to 8): 3.2 ohm
H58 Connector at Amplifier:
Woofer (Pin 1 to 2): 1.4 ohm
Front Left Dash (Pin 3 to 9): 3.3 ohm
Front Right Dash (Pin 4 to 10): 3.7 ohm
Front Center Dash (Pin 8 to 7): 3.4 ohm
H56 Connector at Amplifier: (Checked for voltage using pin 5 'Body Ground')
Vehicle Speed Signal (Pin 2): 14.3V
MOST Communication Wake-up Signal (Pin 3): 14.7V
MOST Communication Signal (Pin 4): 0
MOST Communication Signal (Pin 6): 0
MOST Communication Wake-up Signal (Pin 9): 0
MOST Communication Signal (Pin 10): 0
MOST Communication Signal (Pin 12): 0
H59 Connector at Amplifier:
Power Source (Pin 1 to 2): 14.9V when car is running, ~12V when car is off
Power Source (Pin 3 to 6): 14.9V when car is running, ~12V when car is off
Connectors at radio:
I lost the specific voltage readings, but the head unit had power and ignition.
Additional Information
-The used radios I installed did not work, however I could hear noises coming from the disk changer for a couple of seconds when the car was turned on or after replacing the fuse.
-I bought the car like this, never heard the speakers work.
-The faceplate number is P10041
My plan
-Cry
-bench test spare radios
-replace the 12V battery
-replace the under seat amplifier
If anyone can help or has information please share!
My 2012 CT200h with Navigation has a radio issue. I've replaced it three times, but still no dice. Here are the symptoms:
What works
-The navigation screen flips up and stays on the map view when the car is on
-Back up camera works
-Mouse centers when the car is turned on or off
-Radio lights work and dim accordingly
-USB does charge my phone, but painfully slow (1% per 10 min). My phone does stop playing audio aloud when its plugged in, suggesting the USB port does behave like a receiver
-When I press the phone call buttons on the steering wheel the nav screen switches to a call screen with a num pad.
-Pressing and holding the SOS button on the ceiling the warning comes on that my subscription is up. This is the only noise the speakers have made.
What doesnt work
-Anything that a standard radio would do
-Anything in the infotainment center
-Mouse
-The whole system is effectively dead besides the back up cam and nav screen
What I've tried
-Checked, sanded, and ran continuity tests on the following fuses:
- Rad 1 under the hood
- S Horn under the hood
- Amp 1 and 2 under the hood
- Rad 2 under dash
- Panels under dash
- Meters under dash
- Power Outlet under dash
-Tapped each speaker from the amp connections with a 9 v battery, all made noises.
-Checked to make sure the amp has sufficient power and ground. (note they were 14V+ while the car was running and only 12V+ when turned off)
-Replaced the radio headunit with three different used ones that supposedly worked
-Pressed and held the power button for 15 seconds
-disconnected the 12V battery for 20 min
-Recently (~July 2022) ran a load test on the 12V battery. Load test nearly failed. Battery will be replaced soon.
Impedance and Voltage Checks
H57 Connector at Amplifier:
Rear Left Door (Pin 4 to 11): 3.2 ohm
Rear Right Door (Pin 5 to 12): 3 ohm
Front Right Door (Pin 9 to 10): 3 ohm
Front Left Door (Pin 3 to 8): 3.2 ohm
H58 Connector at Amplifier:
Woofer (Pin 1 to 2): 1.4 ohm
Front Left Dash (Pin 3 to 9): 3.3 ohm
Front Right Dash (Pin 4 to 10): 3.7 ohm
Front Center Dash (Pin 8 to 7): 3.4 ohm
H56 Connector at Amplifier: (Checked for voltage using pin 5 'Body Ground')
Vehicle Speed Signal (Pin 2): 14.3V
MOST Communication Wake-up Signal (Pin 3): 14.7V
MOST Communication Signal (Pin 4): 0
MOST Communication Signal (Pin 6): 0
MOST Communication Wake-up Signal (Pin 9): 0
MOST Communication Signal (Pin 10): 0
MOST Communication Signal (Pin 12): 0
H59 Connector at Amplifier:
Power Source (Pin 1 to 2): 14.9V when car is running, ~12V when car is off
Power Source (Pin 3 to 6): 14.9V when car is running, ~12V when car is off
Connectors at radio:
I lost the specific voltage readings, but the head unit had power and ignition.
Additional Information
-The used radios I installed did not work, however I could hear noises coming from the disk changer for a couple of seconds when the car was turned on or after replacing the fuse.
-I bought the car like this, never heard the speakers work.
-The faceplate number is P10041
My plan
-Cry
-bench test spare radios
-replace the 12V battery
-replace the under seat amplifier
If anyone can help or has information please share!
