Sorry, i put an unnecessary question mark, yes 11 Volt is there

 

The service manual includes the following:

Function Test
CAUTION: Be careful not to scratch or damage the defogger wires with the tester probe.

1. Check for voltage between the positive terminal and body ground with the ignition switch and defogger switch ON.

There should be battery voltage.
• If there is no voltage, check for
- faulty defogger relay.
- faulty defogger switch.
- faulty integrated control unit (KH model).
- an open in the BLK/GRN wire.

• If there is battery voltage, go to step 2.

2. Turn the defogger switch OFF. Check for continuity between the negative terminal and body ground.

• If there is no continuity, check for an open in the defogger ground wire.
• If there is continuity, go to step 3.

3. Touch the voltmeter positive probe to the halfway point of each defogger wire, and the negative probe to the negative terminal.

There should be approximately 6 V with the ignition switch and the defogger switch ON.

• If the voltage is as specified, the defogger wire is OK.
• If the voltage is not as specified, repair the defogger wire.
- If it is more than 6 V, there is a break in the negative half of the wire.
- If it is less than 6 V, there is a break in the positive half of the wire.

 

Voltage of 11V is low. Only sources of drop is wire and relay. Suggest tracing voltage along circuit; fuse box, relay, etc looking for source of voltage drop.

However, even w/ only 11V at first end of rear window defogger, you should get some heating. It may take an infrared temp gauge to register.

good luck