What resistance should be measured between heater relay C81 pin 5 and air distribution control switch C788 pin 1?

The resistance between heater relay C81, pin 5, circuit 15S-FA1 (GN/BU) and air distribution control switch C788, pin 1, circuit 15S-FA13 (GN/RD) should be less than 5 ohms. If yes, go to Pinpoint Test C; if no, repair circuit 15S-FA13 and test the system for normal operation.

What does Pinpoint Test B cover?

Pinpoint Test B addresses 'No operation in all temperature settings.' Step B1 checks the voltage to the temperature control switch on circuit 15-FA39 (GN/BK).

What wire colors are referenced in this procedure?

Circuit 15S-FA1 is GN/BU, circuit 15S-FA13 is GN/RD (also referenced as GN/BU in the repair instruction), and circuit 15-FA39 is GN/BK.

Which connector is associated with the Temperature Control Actuator?

The Temperature Control Actuator uses connector C400, as labeled in the diagram under Pinpoint Test B.

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Ford Contour Heater/Temp Control Pinpoint Test B - No Operation Diagnosis

Pinpoint test service procedure screenshot for heater relay and temperature control switch checks

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Service procedure pinpoint test showing step-by-step resistance and voltage check instructions for the heater relay and temperature control switch circuits.

AI caption January 2005 · Photo 32 of 56

This document is a screenshot of a Ford Tech Service (dealerconnection.com) online service procedure page showing pinpoint diagnostic tests for a climate control (heater/temperature control) system. The visible top portion is step 3 of a pinpoint test instructing the technician to measure resistance between heater relay connector C81, pin 5, circuit 15S-FA1 (GN/BU) and the air distribution control switch connector C788, pin 1, circuit 15S-FA13 (GN/RD). If resistance is less than 5 ohms, the technician proceeds to Pinpoint Test C; if not, the instruction is to repair circuit 15S-FA13 (GN/BU) and retest the system. Below this begins PINPOINT TEST B: NO OPERATION IN ALL TEMPERATURE SETTINGS, with step B1 checking voltage to the temperature control switch on circuit 15-FA39 (GN/BK). The left column shows diagrams referencing the Temperature Control Actuator connector C400 along with ignition switch position icons; the details/actions column for B1 is cut off at the bottom of the screenshot. A diagram illustration code GL1620A is visible. The page is useful for identifying connector pin assignments and wire colors (GN/BU, GN/RD, GN/BK) when diagnosing a heater/temperature control that does not operate.

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Frequently asked questions

What resistance should be measured between heater relay C81 pin 5 and air distribution control switch C788 pin 1?: The resistance between heater relay C81, pin 5, circuit 15S-FA1 (GN/BU) and air distribution control switch C788, pin 1, circuit 15S-FA13 (GN/RD) should be less than 5 ohms. If yes, go to Pinpoint Test C; if no, repair circuit 15S-FA13 and test the system for normal operation.
What does Pinpoint Test B cover?: Pinpoint Test B addresses 'No operation in all temperature settings.' Step B1 checks the voltage to the temperature control switch on circuit 15-FA39 (GN/BK).
What wire colors are referenced in this procedure?: Circuit 15S-FA1 is GN/BU, circuit 15S-FA13 is GN/RD (also referenced as GN/BU in the repair instruction), and circuit 15-FA39 is GN/BK.
Which connector is associated with the Temperature Control Actuator?: The Temperature Control Actuator uses connector C400, as labeled in the diagram under Pinpoint Test B.