REAR CLIMATE CONTROL UNIT INSPECTION

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1. Connect the rear climate control unit connector.

2. Turn the ignition switch to the ON position.

3. Connect the negative (-) lead of the tester to body ground.

4. By inserting the positive (+) lead of the tester into each rear climate control unit terminal, measure the voltage according to the terminal voltage table.

  • If there is any malfunction, inspect the parts under “Inspection item (s)”.
    ― If the parts under “Inspection item (s)” are found to be normal, replace the rear climate control unit.

Terminal voltage table (Reference)

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Terminal | Signal name | Connected to | Measurement condition | Voltage (V) | Inspection item (s)
--- | --- | --- | --- | --- | ---
A | — | — | — | — | —
B | IG2 | Front climate control unit | Ignition switch is at ON position | B+ | • Wiring harness: continuity, short circuit (Rear climate control unit—front climate control unit: B—3B) • Front climate control unit: terminal voltage (1W, 1X)
Ignition switch is at OFF position | 1.0 or less
C | Rear climate control unit communication | Front climate control unit | Because this terminal is for communication, good/no good judgment by terminal voltage is not possible. | —
D | — | — | — | — | —
E | Rear climate control unit communication | Front climate control unit | Because this terminal is for communication, good/no good judgment by terminal voltage is not possible. | —
F | TNS signal | Front climate control unit | Turn the headlight switch to the off position | 1.0 or less | • Wiring harness: continuity, short circuit (Rear climate control unit—front climate control unit: F—3F) • ILLUMI 10 A fuse • TNS relay • Headlight switch
Turn the headlight switch to the TNS position | B+
G | — | — | — | — | —
H | Panel light control input | Front climate control unit | Turn the headlight switch to the TNS position and panel light control switch at MAX | 1.0 or less | • Wiring harness: continuity, short circuit (Rear climate control unit—front climate control unit: H—3H) • Instrument cluster
Turn the headlight switch to the TNS position and panel light control switch at MIN | Approx. 6.5
I | Ground | Front climate control unit | Under any condition: Inspect for continuity to ground | 1.0 or less | • Wiring harness: continuity (Rear climate control unit—front climate control unit: I—3I)
J | — | — | — | — | —