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Do you know how the system works ? Do you know what a wiring diagram is an how to test electrical circuits with a DVOM - digital volt ohmmeter ? This is how to find the problem .
Circuit/System Description
When the ignition is ON, the body control module (BCM) supplies a signal to the rear compartment lid release switch through the trunk release switch signal circuit. When the rear compartment lid release switch is pressed, the voltage within the signal circuit is pulled low and in response, the BCM applies ground to the trunk release relay control circuit, which energizes the coil side of the trunk relay. The switch side of the trunk relay then closes, supplying battery positive voltage through the relay and the latch motor voltage control circuit to the rear compartment lid latch. The rear compartment lid latch, then releases the rear compartment lid so that it may be manually raised to an open position.
Circuit/System Testing
Ignition OFF, disconnect the harness connector at the rear compartment lid release switch.
Test for less than 1 ohm between the ground circuit terminal B and ground.
? If greater than the specified range, test the ground circuit for an open/high resistance.
Ignition ON, verify the scan tool Trunk Switch parameter is Inactive.
? If not the specified value, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the BCM.
Install a 3A fused jumper wire between the signal circuit terminal A and the ground circuit terminal B. Verify the scan tool Trunk Switch parameter is Active.
? If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
If all circuits test normal, test or replace the rear compartment lid release switch.
Component Testing
Ignition OFF, disconnect the harness connector at the rear compartment lid release switch.
Test for infinite resistance between the signal terminal A and the ground terminal B with the switch in the open position.
? If not the specified value, replace the rear compartment lid release switch
Test for less than 2 ohms of between the signal terminal A and the ground terminal B with the switch in the closed position.
? If greater than the specified range, replace the rear compartment lid release switch.
Test for infinite resistance between each terminal and the lid release switch housing/case.
? If not the specified value, replace the rear compartment lid release switch.
hooking up a factory or some other type professional scan tool an checking for DTC'S - diagnostic trouble codes should also be done , could make diagnoses easier .
DTC B2730 (Sedan)
You have probably burnt up the element as it is a 17 year old seat now. The elements are replaceable, but the labor is pretty spendy. To test it you will need a multimeter to check for continuity across the connectors that go to the seat heating elements and check for voltage at the car side of the connector. If you have 12v to one side of the connector and continuity to ground at the other side, and do not have continuity to the seat side between the connectors, you know it is a bad element.
You have two choices ! 1 is take to auto repair shop an have it fixed the correct way . 2 do an anti-theft system by pass , which may not be the problem . These systems do have a problem with the wires breaking at the lock cylinder . When you stick the key into the ignition lock there are two contacts inside that touch the resistor pellet .The resistance of the pellet is read by the BCM ,if correct the vehicle starts , if not the BCM sends a disable signal to the PCM - engine computer to disable the fuel injectors . That's what is happening on your vehicle , starts for a couple of seconds an dies. Fuel injectors are being shut off .
The personal automotive security system (PASS-Key?®) system is designed to prevent the engine from starting if the proper resistance is not sensed from the ignition key. Of the 15 different key codes or resistance values available, only one will work with each body control module (BCM). Once the key code is programmed into the BCM, the resistance value is stored in a non-volatile memory.
The PASS-Key?® system prevents the engine from starting by controlling the starter relay and the powertrain control module (PCM) fuel enable input. If the PCM does not sense the proper frequency signal on the fuel enable input, fuel will not be provided to the engine.
If the wrong resistance value is sensed when the ignition switch is in the RUN position, the BCM will not ground the starter enable circuit and will not output the fuel enable signal for approximately three minutes. The engine is prevented from starting and discourages a thief from trying key codes or resistance values at random.
If the correct resistance value is sensed when the ignition switch is in the RUN position, the BCM will ground the starter enable circuit and output the fuel enable signal. The engine will start normally.
If the PASS-Key?® system detects an open or short to ground when the ignition switch is in the RUN position, the BCM will default to fail enable. Fail enable occurs when the proper key resistance is sensed before the open short to ground occurs. This has to occur for 1 minute before the fail enable is engaged. Fail enable will illuminate the security indicator lamp and allow the operator to stop and start the vehicle until the problem is corrected.
You can test to see what the resistance is with an ohm meter across the pellet on the key . An then find the wires coming out of lock cylinder an see if you read same resistance ,with key in the ignition cylinder . If you do the wires are ok , if not then you can do the by pass . Go to radio shack an buy a resistor of same value an solder it in between the wires of the harness side , not ignition side . But ,if the wires are good an you can read the resistance value ,then you have other problem an need to have Trouble codes checked .
Circuit/System Description
When the transmission is placed into REVERSE, a 12 volt signal is sent to the rearview camera image display module indicating that camera operation is requested. The rearview camera image display module then supplies ignition voltage and ground to the rear vision camera. The rear vision camera sends video information through the rearview camera image display module to the inside rearview mirror through a video signal + and a video signal - circuit. A grounded shielding also wraps the video signal circuits to reduce electronic interference which may degrade the video signal and cause a distorted or otherwise degraded image.
Rearview Camera Image Display Module (UVC)
In the instrument panel behind the driver side knee bolster to the right of the steering column
Do you know how to do electrical testing ?
Rear Vision Camera System Does Not Display
Ignition OFF, disconnect the harness connector at the rear view camera image display module.
Test for less than 1.0 ohm between the ground circuit terminal 3 and ground.
? If greater than the specified range, test the ground circuit for an open/high resistance.
Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 2 and ground.
? If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
Ignition ON, park brake applied, vehicle in REVERSE, verify that a test lamp illuminates between the control circuit terminal 1 and ground.
? If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
Ignition OFF, connect the harness connector at the rear view camera image display module. Disconnect the harness connector at the rearview camera.
Ignition OFF, test for less than 1.0 ohm between the ground circuit terminal B and ground.
? If greater than the specified range, test the ground circuit for an open/high resistance. If the circuit tests normal, replace the rear view camera image display module.
Ignition ON, park brake applied, vehicle in REVERSE, test for 5.8-6.2 volts between the 6-volt reference circuit terminal A and ground.
? If less than the specified range, test the 6-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the rear view camera image display module.
? If greater than the specified range, test the 6-volt reference circuit for a short to voltage. If the circuit tests normal, replace the rear view camera image display module.
Ignition OFF, disconnect the harness connector at the rear view camera image display module.
Test for less then 1 ohm between the shield ground circuit terminal 10 at the rear vision camera display module harness connector and terminal D at the rear vision camera harness connector.
? If greater than the specified range, test the shield ground circuit for an open/high resistance.
Ignition ON, test for less than 1 volt between the signal circuit terminal 9 and ground.
? If greater than the specified range, test the signal circuit for a short to voltage.
Test for infinite resistance between the signal circuit terminal 9 and ground.
? If not the specified value, test the signal circuit for a short to ground.
Test for less then 1 ohm between the signal circuit terminal 9 at the rear vision camera display module harness connector and terminal C at the rear vision camera harness connector.
? If greater than the specified range, test the signal circuit for an open/high resistance.
Ignition OFF, disconnect the harness connector at the inside rearview mirror.
Ignition ON, test for less than 1 volt between the following signal circuits at the inside rearview mirror harness connector and ground:
• Video + signal circuit terminal 6
• Video - signal circuit terminal 7
Test for infinite resistance between the following signal circuits at the inside rearview mirror harness connector and ground:
? If greater than the specified range, test the signal circuit for a short to voltage.
• Video + signal circuit terminal 6
• Video - signal circuit terminal 7
? If greater than the specified value, test the signal circuit for a short to ground.
Test for less then 1 ohm between the following signal circuits:
• Signal circuit terminal 12 at the rearview camera image module and terminal 6 at the inside rearview mirror.
• Signal circuit terminal 11 at the rearview camera image module and terminal 7 at the inside rearview mirror.
? If greater than the specified range, test the signal circuit for an open/high resistance.
If all circuits test normal, test or replace the rear vision camera.
Ignition ON, park brake applied, vehicle in REVERSE, verify a clear rear vision image is displayed on the radio.
? If a clear rear vision image is not displayed, test or replace the inside rearview mirror
some sort of bad connection inside the radios socket
or bad coax
check the antenna with an ohm meter
to see if the coax is shorted out
and also that there is continutity between the center pin of the coax radio plug and the antenna
you can demount the radio and stick a bit of wire in as a quick test
if you get the signal then its something coax related
if not its something to do with the front end of the radios reciever circuit
and you need a radio engineer that fixes car radios and cb etc
they will make it work for sure
i could in ten mins flat ...possibly a transistor has failed
or a bad connection as it comes and goes ...
B2470
Cellular Phone Antenna Circuit Malfunction
VCIM
DTC B2470
DTC B2470 04: Cellular Phone Antenna Circuit Malfunction Open Circuit
The cellular antenna is connected to the communication interface module (CIM) with a RG-58 coax cable. The CIM polls the data from the cellular antenna once every second.
Circuit/System Testing
Ignition OFF, disconnect the cellular antenna coax from the CIM module and the cellular antenna.
Ignition ON, test for less than 1 volt between the antenna coax center terminal and ground.
? If greater than the specified range, replace the antenna coax.
Ignition ON, test for less than 1 volt between the antenna coax outer shield and ground.
? If greater than the specified range, replace the antenna coax.
Test for infinite resistance between the antenna coax center terminal and ground.
? If less than the specified value, replace the antenna coax
Test for infinite resistance between the antenna coax outer shield and ground.
? If less than the specified value, replace the antenna coax
Test for less than 5 ohms at the cellular antenna coax center terminal from end to end.
? If greater than specified value, replace the cellular antenna coax cable.
Test for less than 5 ohms at the cellular antenna coax outer shield from end to end.
? If greater than specified value, replace the cellular antenna coax cable.
Test for infinite resistance between the antenna coax center terminal and the outer shield.
? If less than specified value, replace the cellular antenna coax cable.
If coax cable tests normal, replace the cellular antenna.
Clear the DTCs and operate the vehicle within the conditions for running the DTC. Verify DTC B2470 does not set.
? If the DTC sets, replace the CIM.
The ECT (Engine Coolant Temperature) sensor is a thermal variable resistor (also known as a "thermistor"). The ECT delivers a signal to the THW terminal of the Engine Control Module (ECM) which varies with engine coolant temperature. The ECM uses this signal to control the fuel injection system, the overdrive operation on vehicles equipped with electronically controlled overdrive transmissions, spark timing control, idle speed control, fuel pressure control system (if equipped), heated oxygen sensor system (if equipped) and EGR systen (if equipped)
It sounds like the antenna has come loose in the back of the radio. It might be a bad antenna ground on the antenna atached to the car as well. Pull the raideo and check to see if the antenna is pluged in to the back of the raido, and if it is, lossen it from the radio and check to see if you can clean it, and plug it back in and you should resove your problem
the usual cause of this is a defective antenna or antenna ground, if it is a power antenna verify a good ground, if ok replace the antenna, also check the coax connector to the back of the radio.
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