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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSBMW1993740IL (E32/2) V8-3982CC 4.0L DOHC (M60)REPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGDESCRIPTION AND OPERATIONCLIMATE CONTROL SYSTEMS, SYSTEM SPECIFICIHKA (AUTOMATIC CLIMATE CONTROL SYSTEM)TEST MODE
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)
Test Mode
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)SECTION Test Mode
Test mode for Independent heating/ventilation with interchanged temperature threshold
1. Switch ignition key to position "R".
2. Press BC button "Time".
3. Simultaneously depress BC buttons "Time" and "A-Temp." for approximately 3 seconds until "In heat" or "In vent" appear in the display.
4. Press BC button S/R (LEDs in Time button flash), independent heating/independent ventilation operates (after starting, allow independent heating to run for at least 5 minutes).
5. Press the "S/R" button to terminate inverse mode.
NOTE: The relay box only switches the IHKA control unit to independent heating in ignition switch position "0". In this position, however, inverse mode is cancelled by the on-board computer. If only a multitunction clock is installed, it can also be switched to inverse mode by pressing the outside temperature button (3 seconds).
1. Switch ignition key to position "R".
2. Press BC button "Time".
3. Simultaneously depress BC buttons "Time" and "A-Temp." for approximately 3 seconds until "In heat" or "In vent" appear in the display.
4. Press BC button S/R (LEDs in Time button flash), independent heating/independent ventilation operates (after starting, allow independent heating to run for at least 5 minutes).
5. Press the "S/R" button to terminate inverse mode.
NOTE: The relay box only switches the IHKA control unit to independent heating in ignition switch position "0". In this position, however, inverse mode is cancelled by the on-board computer. If only a multitunction clock is installed, it can also be switched to inverse mode by pressing the outside temperature button (3 seconds).
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.