Inspect Heater Control Base Subassembly

(a) Check the heater control base resistance.

(1) Using an ohmmeter, measure the resistance and check the results in accordance with the values in the table below. Standard resistance

Tester Connection

Condition

Specified Condition

2 (L) - 3 (E)

Always

10 kQ or higher

2 (L) - 4 (B)

A/C switch OFF

10 kQ or higher

3 (E) - 4 (B)

Always

10 kQ or higher

2 (L) - 4 (B)

A/C switch ON

Below 1 Q

5 (ILL+) - 6 (ILL-)

Always

Below 1 Q

If the result is not as specified, replace the heater control base.

(b) Check the A/C indicator operation.

(1) Connect the positive (+) lead from the battery to terminal 2 (L) and the negative (-) lead to terminal (E).

(2) Push the A/C switch in and check that the indicator lights up.

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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