Need Injection control unit wiring diagram MB W-124 1989 300E

Question edited for clarity.
Question moved to model category.

https://www.google.com/search?q=metra+wiring+harness+diagram

and

2016 1500 radio wiring diagram

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Oct 7, 2017 - Hi, After being convinced to put in an amp, I need some help wiring my Audio control Lc6i. I have the base system, not the Alpine .

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You buy a harness from the the aftermarket radio shop that supplies you with the new radio.

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Edited the first part for clarity.

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Best advise is to pick up a factory plug from a pick a part or salvage yard and repair the factory harness. If you still want an aftermarket head unit, there are adapter connectors that go between the factory connector and the head unit connector.

Trailers with electric brakes need them too. The 7-Way Trailer Plug is around 2? diameter connector that allows an additional pin for an auxiliary 12-volt power or backup lights.
https://www.ajtnt.com/Info/7-Way-Diagram
Connect to the brake controller and route the black and blue wires. Find the blue wire that comes off of your electronic brake controller. Attach the blue wire that came with your 7-wire plug to this blue wire. Locate the rubber grommet that surrounds the interior wiring harness where it feeds through the firewall.
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contact your local Auto parts store.. They should have the diagram and should be able to print it up or E-mail it..

I am sorry but we do not have wiring diagrams at this site.

Youi will need the vehicles wiring diagrams to figure that out. They may go nowhere, the wiring harness used in modern cars is the same for all variants and trim levels, so many models may not have a certain device but the connectors will be on the harness anyway.

I would check the wires that make the injector function to see how much power is going to them (using a multimeter). Now check the wires on the injector that is not working and see if you have power there. If you do then you have a bad injector. I don't think you do since you said that you switch wires and you are getting fuel at that injector. Check your wiring harness for shorted out wires. It doesn't make sense for one side to be working and the other not to be. I don't think it is a problem with your ECU, but it may be. See what colors the wires are going to your injectors and trace them back to the ECU, a wiring diagram would help. You need to check to see if you are getting power from the control module to the harness. I believe, however, you are experience a shorted out wire somewhere in the harness. That is where I would start. If you confirm you are getting power to the control module, but you are losing it somewhere in the harness it may be easier to just run a new set of wires instead of tearing apart the harness.

please rate me solved...thanks

DTC P0411/16795: SECONDARY AIR SYSTEM - INCORRECT FLOW DETECTED
Test Requirements
Ensure all fuses are okay, battery voltage is at least 11.5 volts, all electrical accessories are off, A/C is off.
Ensure engine is mechanically sound.
Test Procedure

NOTE
Secondary air system is activated by ECM and blows air into exhaust pipe
upstream of catalytic converter for 100 seconds during a cold start, 41-91°F (5-
33°C). Engine must be cold to perform following test procedure.

1. Ensure fuse and secondary fuse (secondary fuse is 40 amp and is located in fuse holder on top of battery)
are okay. Check hoses and components of Secondary Air Injection System, for damage, loose fit and
improper installation, check vacuum hoses for Secondary Air Injection System. Repair as necessary.
Erase DTC memory. Verify repair. If DTC does not reset, test is complete. Perform ECM relearn
procedure. See TEST DRIVE RELEARN PROCEDURE .
2. Remove engine cover. Disconnect pressure hose from Secondary Air Pump Motor (V101), by pressing
buttons on hose connector. See Fig. 33 . Using scan tool, check Secondary Air Pump Motor (V101) in
scan tool Output Diagnostic Test Mode (Secondary Air Pump Relay activation mode). See OUTPUT
DIAGNOSTIC TEST MODE .
3. Secondary Air Pump Motor (V101) should run in intervals and air should exit pump at hose connection.
If Secondary Air Pump Motor (V101) is okay, go to step 7 . If motor runs and no air exits secondary air
pump motor, replace faulty Secondary Air Pump Motor (V101). Erase DTC memory. Verify repair. Test
is complete. Perform ECM relearn procedure. See TEST DRIVE RELEARN PROCEDURE . If
secondary air pump motor does not run, go to next step.
4. Disconnect Secondary Air Pump Motor (V101) harness connector, install LED test light at secondary air
pump harness connector terminals. Turn ignition on. Using scan tool, activate Secondary Air Pump Motor
(V101) in scan tool Output Diagnostic Test Mode (Secondary Air Pump Relay activation mode). See
OUTPUT DIAGNOSTIC TEST MODE . LED test light at Secondary Air Pump Motor (V101) harness
connector should flash. If LED test light at Secondary Air Pump Motor (V101) harness connector does
not flash, go to next step. If LED test light at Secondary Air Pump Motor (V101) harness connector
flashes, replace faulty Secondary Air Pump Motor (V101). Erase DTC memory. Verify repair. Test is
complete. Perform ECM relearn procedure. See TEST DRIVE RELEARN PROCEDURE .
5. Using DVOM check resistance of Secondary Air Pump Motor (V101) wiring. See appropriate WIRING
DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. Resistance should
be a maximum of 1.5 ohms for each reading. Check wiring for short circuit to one another in Secondary
Air Pump Motor (N101) harness connector. Repair as necessary. Erase DTC memory. Verify repair. Test
is complete. Perform ECM relearn procedure.
Secondary Air Pump Motor (N101) wiring is okay, go to next step.
6. Check Secondary Air Pump Relay (J299) and Secondary Air Pump Relay (J299) wiring. See DTC
P0418/16802: SECONDARY AIR PUMP RELAY (J299), MALFUNCTION . Repair or replace as
necessary. Erase DTC memory. Verify repair. Test is complete. Perform ECM relearn procedure. See
TEST DRIVE RELEARN PROCEDURE .
7. Disconnect vacuum hose from Secondary Air Injection Valve (N112) and disconnect pressure hose from
secondary air pump motor, press buttons on pressure hose connector to disconnect pressure hose. See Fig.
34 . Blow lightly into disconnected pressure hose, Combi-Valve should be closed. Connect hand vacuum
pump to disconnected vacuum hose and apply vacuum to Combi-Valve, Combi-Valve should open. If
Combi-Valve opens when vacuum is applied, Combi-Valve is okay. Go to next step. If Combi-Valve
does not open when vacuum is applied, replace faulty Combi-Valve. Erase DTC memory. Verify repair.
Test is complete. Perform ECM relearn procedure. See TEST DRIVE RELEARN PROCEDURE .
8. Check Secondary Air Injection Valve (N112). See DTC P0412/16796: SECONDARY AIR
INJECTION VALVE (N112), ELECTRICAL CIRCUIT MALFUNCTION . Repair as necessary.
Erase DTC memory. Verify repair. Test is complete. Perform ECM relearn procedure.
NOTE: Do not use compressed air to check Combi-Valve.
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2000 ENGINE PERFORMANCE Self-Diagnostics - 1.8L Turbo