Code L: Mode Control Motor Open/Short Circuit
- Disconnect air mix control motor connector. Disconnect climate control unit 20-pin connector. See Figure . Use a DVOM to individually check continuity between ground and terminals A5, A6, A11, A17, A18, A19 and A20 of climate control unit 20-pin connector. If continuity exists, repair short in suspect wire. If continuity does not exist, go to next step.
- Turn ignition on. Use a DVOM to individually check for voltage between ground and terminals A5, A6, A11, A17, A18, A19 and A20 of climate control unit 20-pin connector. See WIRING DIAGRAMS . If voltage exists, repair short to power in suspect wire(s). Short to power will damage climate control unit, repair short before replacing climate control unit. If voltage does not exist, go to next step.
- Turn ignition off. Use a DVOM to check continuity between climate control unit 20-pin connector and mode control motor connector terminals. See MODE CONTROL MOTOR CIRCUIT CONTINUITY table. If continuity does not exist, repair open in suspect wire. If continuity exists, check for loose wires and or poor connections at mode control motor and climate control unit. Repair any problems found. If wiring and connectors are okay, substitute a known-good climate control unit and recheck. If system operates properly, replace climate control unit. See CLIMATE CONTROL UNIT under REMOVAL & INSTALLATION.
MODE CONTROL MOTOR CIRCUIT CONTINUITY
| Climate Control Unit 20-Pin Connector Terminal | Mode Control Motor Connector Terminal No. |
|---|---|
| A5 | 1 |
| A6 | 2 |
| A11 | 7 |
| A17 | 3 |
| A18 | 4 |
| A19 | 5 |
| A20 | 6 |