How do I replace the Control Module?

Anonymous wrote the right answer.

Anonymous Jan 02, 2022

What kind of scan tool ? Will it scan all the modules on the vehicle or is it just OBD2 type ? Did you check wiring diagrams an test electrical circuits for air ride an test with a DVOM - digital volt ohmmeter ? Do you know how to test ALC relay circuits . You replaced a bunch of parts that probably were not needed (,air ride compressor, fuses and ALC relay and the compressor still won't work ) ?

Which of these does your vehicle have

Automatic Level Control
Electronic Suspension Control (ESC)
The vehicles rear leveling compressor motor is switched on and off via a compressor motor relay which is controlled by the suspension control module. The suspension control module provides a switched path to ground whenever compressor activity is required. The suspension control module continually monitors the compressor motor relay circuitry to determine if the voltage level agrees with the commanded state.

DTC C0655 Level Control Compressor Circuit

DTC C0660 Level Control Exhaust Valve Circuit

The exhaust solenoid valve is switched on and off via the suspension control module. The suspension control module provides a switched path to ground whenever exhaust activity is required and during a compressor "head-relief" sequence which occurs at compressor start-up if system pressure is lower than 68.95 kPa (10 psi). The suspension control module continually monitors the exhaust solenoid valve circuitry to determine if the voltage level agrees with the commanded state.

DTC C0711 Level Control Air Pressure Sensor Circuit

Circuit Description
The suspension control module uses a 5-volt analog air pressure sensor to determine the amount of air pressure in the automatic level control (ALC ) system. The valid signal voltage range of the sensor is 0.15-4.85 volts. The sensor signal voltage will increase and decrease within the valid voltage range as system pressure increases and decreases.


Your best bet ,take it to a qualified repair shop that knows what they are doing .

P1604 TOYOTA - Startability Malfunction
Repair Importance Level: 3/3
Repair Difficulty Level: 3/3

Possible causes
Low Battery charge
Starting system
Low quality fuel
Clogged Fuel filter
Faulty Engine Control Module (ECM)

Heated Seat System Operation
The driver and passenger heated seats have 2 heat zone operating modes with 3 heat level modes and will operate only while the engine is running. The heat zones are determined by which of the 2 heated seat buttons are pressed, while the heat level is determined by the number of times they are pressed. Pressing the seat cushion button 1 time will activate the seat back and cushion heater elements in the high mode. Each time the seat cushion button is pressed the seat back and cushion heat level is reduced from high to medium, low, and off. Pressing the heated seat back button 1 time will activate only the seat back heater element in the high mode. Each time the seat back button is pressed the seat back heat level is reduced from high to medium, low, and off. During heated seat operation the heat zone operating mode may be changed without affecting the current heat level mode.
The heated seat switches are momentary contact switches and are inputs to the driver and passenger door modules. Battery voltage is supplied to the switch assembly from the door module, and when a heated seat switch is pressed and released a brief switch signal voltage is supplied to the door module. Whenever the door module receives an active heated seat switch input, the next heated seat operating mode is determined by whatever the current mode may be. The seat heater elements are controlled by the driver seat module using inputs from the door modules through Class 2 serial data circuit messages. The driver seat module controls the voltage supply and the ground circuits to the seat heater elements. When a heated seat function is commanded active, the seat module will switch battery voltage to the heater element supply circuits, and ground is provided through low side drive control circuits. During heated seat operation both the seat back and cushion heater elements are supplied battery voltage. The seat module grounds the appropriate control circuits for back only or back and cushion heating modes, and opens or closes the active control circuits as necessary in order to maintain the desired seat temperature. The seat module relies on inputs from thermistors located in the driver and passenger seat backs to control heated seat temperatures. The thermistors are 2 wire sensors supplied with a 5-volt referenced signal circuit and a low reference circuit from the seat module. Resistance through the thermistors varies with temperature causing the heated seat sensor signal circuit voltage levels to decrease as the seat back temperatures rise. The seat modules allow heated seat operation only while the engine is running which is determined by a Class 2 serial data circuit message from the powertrain control module.

Heated Seat Components
The heated seat system consists of the following components:
• Driver and passenger heated seat switches
• Driver and passenger seat back heater elements
• Driver and passenger seat cushion heater elements
• Driver and passenger seat back temperature sensors
• Driver seat module
• Driver door module
• Passenger door module

Do you know what B - body DTC -diagnostic trouble code are ?
DTC B2425 Driver Seat Heater Circuit
DTC B2435 Driver Seat Back Heater Sensor Circuit
DTC B3941 Front Seat Heaters Circuit

Heated Seat Always On
Step
Action
Yes
No
Schematic Reference: Driver Seat Schematics and Passenger Seat Schematics
Connector End View Reference: Power Seat Connector End Views
1
Did you perform the Diagnostic System Check - Vehicle?
Go to Step 2
Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2
Operate the heated seat system.
Does the system operate normally?
Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
Go to Step 3
3
Install a scan tool.
Display the Heated Seat Status parameter in the driver seat module Input/Output data list.
Start the engine.
Does the scan tool display the Heated Seat Status parameter as Off?
Go to Step 6
Go to Step 4
4
Display the Heated Seat Mode parameter in the door module Inputs data list.
Does the scan tool display the Heated Seat Mode parameter as OFF?
Go to Step 6
Go to Step 5
5
Turn OFF the ignition.
Disconnect the heated seat switch connector to the door module.
Start the engine.
Does the scan tool display the Heated Seat Mode parameter as OFF?
Go to Step 7
Go to Step 8
6
Replace the driver seat module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.
Is the repair complete?
Go to Step 9
--
7
Replace the heated seat switch. Refer to Front Seat Heater Switch Replacement .
Is the repair complete?
Go to Step 9
--
8
Replace the door module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.
Is the repair complete?
Go to Step 9
--
9
Operate the system in order to verify the repair.
Did you correct the condition?
System OK
Go to Step 3


your best bet , have a qualified repair shop diagnose the problem

Take it to a qualified repair shop . Would need to hook up a factory scan tool or a professional one , check DTC'S - diagnostic trouble codes instrument cluster , an HVAC - heating & A/C control module . Why did you replace the fuel pump module ? Did you replace the fuel level sending unit ? You should not mess with thing's you have no clue about .

DTC C0655
Level Control Compressor Relay Malfunction .
You start by doing the diagnostic tests for that code .
Circuit Description
The automatic level control adjusts the vehicle suspension ride height. The RIM determines the height of the vehicle based on the voltage from the automatic level control sensor. The RIM grounds the compressor relay and the exhaust control solenoid to raise and lower the vehicle in order to keep the vehicle level.

Diagnostic Aids
• Inspect all wiring harnesses carefully for chaffs and proper routing. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
• This circuit is monitored before every functional operation of the compressor relay output. If a compressor relay fault is detected, the RIM retries the output every 15 seconds to try to recover from the fault.

Your probably not going to be able to do the factory diagnostics unless you have a factory scan tool to turn on an off the relay . You can test with a volt meter at the relay for B+ voltage and control from the RIM - Rear Integration Body Control Module. Do you know what a relay is and how it works ?

2
Install a scan tool.
Turn ON the ignition, with the engine OFF.
With a scan tool, command the level control compressor relay ON and OFF.
Does the level control compressor relay turn ON and OFF with each command?
--
YES Go to Diagnostic Aids
NO Go to Step 3
3
Turn OFF the ignition.
Disconnect the level control compressor relay .
Turn ON the ignition, with the engine OFF.
Probe the coil side feed circuit of the level control compressor relay with a test lamp that is connected to a good ground.
Does the test lamp illuminate?
--
YES Go to Step 4
NO Go to Step 10
4
Connect a test lamp between the control circuit of the level control relay and the coil side feed circuit of the level control compressor relay.
With a scan tool, command the level control compressor relay ON and OFF .
Does the test lamp turn ON and OFF with each command?
--
YES Go to Step 8
NO Go to Step 5
5
Does the test lamp remain illuminated with each command?
--
YES Go to Step 7
NO Go to Step 6
6
Test the control circuit of the level control compressor relay for a short to voltage or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
--
YES Go to Step 13
NO Go to Step 9
7
Test the control circuit of the level control compressor relay for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
--
YES Go to Step 13
NO Go to Step 9
8
Inspect for poor connections at the level control compressor relay . Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?
--
YES Go to Step 13
NO Go to Step 11
9
Inspect for poor connections at the harness connector of the RIM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?
--
YES Go to Step 13
NO Go to Step 12

10
Repair the coil side feed circuit of the level control compressor relay . Refer to Wiring Repairs in Wiring Systems.
Did you complete the repair?
--
YES Go to Step 13
--
11
Replace the level control compressor relay.
Did you complete the replacement?
--
YES Go to Step 13
--
12
Replace the RIM. Refer to Rear Integration Body Control Module Replacement in Body Control System.
Did you complete the replacement?
--
YES Go to Step 13
--
13
Use the scan tool in order to clear the DTCs .
Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC reset?
--
Go to Step 2
System OK

What unwanted dash light's ? Gas gauge sending unit in the fuel tank could be bad or the gauge it self could be bad . Installing a scan tool first off an checking for DTC'S - diagnostic trouble codes is the place to start . GM had bad step motors inside the instrument cluster . Year's 2003 to 2006 . Videos on youtube show how to replace. can buy at amazon.com .

Low Fuel
The low fuel telltale is turned ON by the cluster when it receives a command from the body control module (BCM) (L81) engine or the powertrain control module (PCM) (L61) engine. The cluster will turn the LED ON when the fuel level in the tank reaches approximately 1.5 gallons.
The low fuel telltale will be turned ON by the cluster for 2-3 seconds, when the ignition is turned to RUN, for a visual system check.

Fuel Gage
The input information for the fuel gauge is sent over the Class 2 serial data link by the body control module (BCM) on V6 (L81) engine appications. Information is sent by the PCM on the 4 cylinder (L61) engine applications to the BCM. The cluster will position the needle on the gauge based on the fuel level information sent by the BCM.

Install a scan tool.
Turn ON the ignition, with the engine OFF.
With a scan tool, observe the Fuel Level parameter in the Powertrain Fuel and Emissions list.
Does the scan tool indicate that the Fuel Level parameter is greater than the specified value?
If you do not have a professional scan tool your best bet , take your vehicle to a qualified repair shop .

66. (01000001) Pressure Transducer Error [Ptx Frequency > 90 kHz]
Note: this supersedes Fault code 65 from V41 Motor controller code onwards.
The Motor Control module has received signals from the water level sensor (Ptx)
above normal frequency values.
Primary Source: Motor Control module
Action: Replace Motor Control module

I took this from the service repair manual. Hope it helps.

HI error code 66 means you have a pressure transducer out of range error.This means that the control module is faulty and needs replacing.please confirm that the error code is numbered 66. On some machines the pressure switch is seperated and sometimes the plastic tub for the switch gets clogged up and blowing through it will sometims clear this fault. Not sure about this particular machine, but you can try adjusting water level to see if it will work at a different level of water.