Stratus Coupe V6-3.0L VIN H (2001)
Ignition Switch (IG1) Input Circuit
CIRCUIT OPERATION
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The ETACS-ECU operates various functions according to the input signal from the ignition switch (IG1).
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This circuit will work as a backup circuit if the battery circuit to the ETACS-ECU is open circuit.
TECHNICAL DESCRIPTION (COMMENT)
The ignition switch (IG1) input signal is used to operate the following devices or functions:
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Ignition key reminder tone alarm function
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Light reminder tone alarm function
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Door ajar tone alarm function
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Low washer fluid level tone alarm function
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Seat belt tone alarm function
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Low fuel level tone alarm function
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Rolling lock function
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Power window timer function
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Sunroof timer function
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Low washer fluid level warning light
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Seat belt warning light
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Headlight automatic shutdown function
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Turn-signal light
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Interior light dimming function
If the signal fails, these devices will not work normally.
TROUBLESHOOTING HINTS
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Malfunction of the ETACS-ECU
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Damaged harness wires or connectors
DIAGNOSIS
Required Special Tools:
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MB991223: Test Harness Set
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MB991502: Scan Tool (MUT-II)
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MB991529: Diagnostic Trouble Code Check Harness
STEP 1. Check the ignition switch (IG1) circuit at the ETACS-ECU connector C-311.
1. Disconnect the ETACS-ECU connector C-311 and measure at the junction block side.
2. Turn the ignition switch to the "ON" position.
3. Measure the voltage between terminal 11 and ground.
Q: Is the voltage approximately 12 volts (battery positive voltage)?
YES: Replace the ETACS-ECU. The ignition switch (IG1) input signal should be able to be checked and the functions, which are described in
the "Technical Description (comment)," should work normally.
NO: Go to Step 2.
