Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSBMW1993740IL (E32/2) V8-3982CC 4.0L DOHC (M60)REPAIR AND DIAGNOSISLIGHTING AND HORNSINTERIOR LIGHTING MODULETESTING AND INSPECTIONDESCRIPTION OF ON-BOARD DIAGNOSTIC SYSTEM
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)
Description of On-Board Diagnostic System
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)SECTION Description of On-Board Diagnostic System
Notes on the BMW DIAGNOSTIC SYSTEM:
With *D* MONITOR OUTPUTS, a check can be made as to whether the interior light relay in the relay module is switched on by the general module. The display does not depend on the position of the interior light switch.
The interior light control system is not included in the defect code memory of the central body electronics (ZKE). Troubleshooting is possible with the status lists only.
The interior light control is selected via the door lock heating system. If a door lock heating system is not installed, the "door lock heating" detect is of no significance.
A door lock contact can be installed only if the vehicle is equipped with a door lock heating system.
Troubleshooting:
Notes:
- Troubleshooting with the BMW DIAGNOSTIC SYSTEM
- Battery charged, U-min = 12 V
- If all central body electronics functions ZKE have failed, carry out troubleshooting in accordance with Central Body Electronics (ZKE).
Important!
When the supply voltage is applied (terminal 30 at Pin Al), the ZKE general module detects which part systems are installed in the vehicle. Undefined contacting when plugging in the module can result in systems not being detected. Therefore:
Disconnect vehicle battery before installing a ZKE general module!
or:
Disconnect the vehicle battery for at least 5 seconds after installing a ZKE general module.
Also refer to Central Body Electronics (ZKE), Functional Description and Troubleshooting.
With *D* MONITOR OUTPUTS, a check can be made as to whether the interior light relay in the relay module is switched on by the general module. The display does not depend on the position of the interior light switch.
The interior light control system is not included in the defect code memory of the central body electronics (ZKE). Troubleshooting is possible with the status lists only.
The interior light control is selected via the door lock heating system. If a door lock heating system is not installed, the "door lock heating" detect is of no significance.
A door lock contact can be installed only if the vehicle is equipped with a door lock heating system.
Troubleshooting:
Notes:
- Troubleshooting with the BMW DIAGNOSTIC SYSTEM
- Battery charged, U-min = 12 V
- If all central body electronics functions ZKE have failed, carry out troubleshooting in accordance with Central Body Electronics (ZKE).
Important!
When the supply voltage is applied (terminal 30 at Pin Al), the ZKE general module detects which part systems are installed in the vehicle. Undefined contacting when plugging in the module can result in systems not being detected. Therefore:
Disconnect vehicle battery before installing a ZKE general module!
or:
Disconnect the vehicle battery for at least 5 seconds after installing a ZKE general module.
Also refer to Central Body Electronics (ZKE), Functional Description and Troubleshooting.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.